import base64
from odoo import models, fields
from odoo import modules


def get_default_img():
    with open(modules.get_module_resource('my_module', 'static/img', 'my_image.png'),
              'rb') as f:
        return base64.b64encode(f.read())



class MyModel(models.Model):
    _name = 'my.model'

    field_binary = fields.Binary(default=get_default_img())

This is the answer, thread will be closed, thanks

src : https://www.iwesabe.com/blog/how-to-set-default-image-for-binary-field-odoo