Hello Hoang Quan,

Please find below code for the excel report of particular product. Add button in Product form view with method name "product_template_excel_report".

PY File :-
==========

from odoo import models, fields, api, _
from odoo.exceptions import UserError
from datetime import date, timedelta, datetime
import datetime
from odoo.tools import DEFAULT_SERVER_DATE_FORMAT
import tempfile
from odoo.tools.misc import xlwt
import io
import base64
import time
from dateutil.relativedelta import relativedelta
from pytz import timezone

class ProductTemplate(models.TransientModel):
    _inherit = 'product.template'

    @api.multi
    def product_template_excel_report(self):
        filename= 'Product Report ' + str(self.name) + '.xls'
        workbook= xlwt.Workbook()

        worksheet= workbook.add_sheet('Product Report')
        font = xlwt.Font()
        font.bold = True
        for_left = xlwt.easyxf("font: bold 1, color black; borders: top double, bottom double, left double, right double; align: horiz left")
        for_left_not_bold = xlwt.easyxf("font: color black; align: horiz left")
        for_center_bold = xlwt.easyxf("font: bold 1, color black; align: horiz center")
        GREEN_TABLE_HEADER = xlwt.easyxf(
            'font: bold 1, name Tahoma, height 250;'
            'align: vertical center, horizontal center, wrap on;'
            'borders: top double, bottom double, left double, right double;'
            )
        style = xlwt.easyxf('font:height 400, bold True, name Arial; align: horiz center, vert center;borders: top medium,right medium,bottom medium,left medium')

        alignment = xlwt.Alignment()  # Create Alignment
        alignment.horz = xlwt.Alignment.HORZ_RIGHT
        style = xlwt.easyxf('align: wrap yes')
        style.num_format_str = '0.00'

         worksheet.row(0).height = 320
        worksheet.col(0).width = 4000
        worksheet.col(1).width = 4000
        borders = xlwt.Borders()
        borders.bottom = xlwt.Borders.MEDIUM
        border_style = xlwt.XFStyle()  # Create Style
        border_style.borders = borders

        product_title = 'Product Report ' + str(self.name)
        worksheet.write_merge(0,1,0,2,product_title,GREEN_TABLE_HEADER)

        row = 2

         worksheet.write(row, 0, 'Product Name' or '',for_left)
        worksheet.write(row, 1, 'Sales Price' or '',for_left)

        row = row + 1
        worksheet.write(row, 0, self.name or '',for_left_not_bold)
        worksheet.write(row, 1, self.list_price or '',for_left_not_bold)

        fp = io.BytesIO()
        workbook.save(fp)
        product_id = self.env['product.excel.extended'].create({'excel_file': base64.encodestring(fp.getvalue()), 'file_name': filename})
        fp.close()

        return{
            'view_mode': 'form',
            'res_id': product_id.id,
            'res_model': 'product.excel.extended',
            'view_type': 'form',
            'type': 'ir.actions.act_window',
             'context': self._context,
             'target': 'new',
         }


class ProductExcelExtended(models.Model):
        _name = 'product.excel.extended'
        _description = "Product Excel Extended"

         excel_file = fields.Binary('Download Report :- ')
         file_name = fields.Char('Excel File', size=64)



XML File :-
===========

<?xml version="1.0" encoding="utf-8"?>
<odoo>

     <!-- Excel Report Download Wizard Form View-->
     <record id="view_product_excel_form_extended" model="ir.ui.view">
     <field name="name">product.excel.extended.form</field>
     <field name="model">product.excel.extended</field>
     <field name="arch" type="xml">
     <form string="Excel Report file">
         <group>
             <field name="excel_file" readonly="1" filename="file_name"/>
             <field name="file_name" invisible="1"/>
         </group>
         <footer>
             <button string="Cancel" class="oe_link oe_highlight" special="cancel"/>
        </footer>
         </form>
         </field>
    </record>

     <!-- Excel Report Download Wizard Action View-->
     <record id="action_product_excel_form" model="ir.actions.act_window">
         <field name="name">Reports Excel</field>
         <field name="view_id" ref="view_product_excel_form_extended"/>
         <field name="view_type">form</field>
         <field name="view_mode">form</field>
         <field name="res_model">product.excel.extended</field>
         <field name="target">new</field>
     </record>

</odoo>

CSV File :-
===========

id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
access_product_excel_extended,access.product.excel.extended,model_product_excel_extended,,1,1,1,1

Hope it will helps for you.

Thanks,