Hi, hope you it help
https://www.odoo.com/es_ES/forum/ayuda-1/question/how-to-create-excel-report-in-odoo9-100612#answer-100638

Hello Ameer,

You can do so by using import xlsxwriter python library, you can have reference from the link:http://xlsxwriter.readthedocs.org/example_images.html to use buit in methods, if need more information do let me know on someshkhare07@gmail.com

I will help you in that.

Thanks,

Somesh Khare(Odoo Expert)