Naw a days we can see mejority of person in the world celebrating their birht day by spending huge money that I think like the activities of shaytan,the enemy of humanity.naw I want to know that celebrating birth day is prohibitted or not?

Salaams,

Yes, it is prohibited in Islam.

Islam Question and Answer - Celebrating birthdays is not allowed (http://www.islam-qa.com/en/ref/1027/birthdays)