add this codes to your rml file:
<drawRightString x="19.5cm" y="0.3cm">Page: <pageNumber/> from <pageCount/></drawRightString>
How to add total page to Odoo Report(7.0 version),布布扣,bubuko.com
How to add total page to Odoo Report(7.0 version)
原文：http://www.cnblogs.com/kfx2007/p/3850351.html