Borislava Kostadinova was born on 24 October 1981 in Pleven, Bulgaria. The first theatre performances are in the Children Theatre Studio, which is a part of Drama Theatre "Ivan Radoev" - Pleven. She graduated in 2003 from Theatre College "Luben Groys" - Sofia, majoring in “Acting for Drama Theatre”, Artistic Director - Georgi Novakov.

First performance in professional theatre is in 2003 at the Drama Theatre “Nevena Kokanova” - Yambol, where Borislava Kostadinova plays Liz in "Billy Liar”, Director Boiko Iliev. Then she was invited to Rodopian Drama Theater “Nikolay Haitov” - Smolyan, where gets inspired by the troupe, projects, director and enjoys working there for almost six years. Meanwhile, she works as guest-actress by Diana Dobreva in New Drama Theatre “Tear and Laugh” – Sofia, to the one of the most successful performances in 2010 - "Casanova".

Starting 2011 she works as a freelance actress. Last performance where she plays is “Dekameron” by Djovani Bokaco at the Theatre Bulgarian Army - Sofia, Director Diana Dobreva.