He started his acting career in Doordarshan's television serial Naurangilal ke Sapne. In this serial he got a role as the central character and the serial became a big hit in small screen. His dream turned to reality when once Ram Gopal Varma spotted him in the audience of Mast and also in a small role as a server in a cafe. RGV gave him a very challenging role in Jungle. After that big hit Rajpal preferred comic roles such as in Pyaar Tune Kya Kiya and became well known comedian in Hindi films. He acted in so many films which include Hungama, Waqt: The Race against Time, Chup Chup Ke, Garam Masala, Phir Hera Pheri, and Dhol.