Muthu Kaalai is a Tamil comedy actor. He was born in a village called Sangampatti near Rajapalayam in Virudhunagar district. He worked in a grocery shop and also has worked under the building contractors. At an early age, he started to learn martial arts. He learnt gymnastics, Karate and Silambam. He has received the Black Belt in Karate. Then, he started his journey to Chennai to seek chances to act in the cinema. He stayed with his friends and worked hard for his living. He says that, he came to Chennai to act in cinema as a fighter. He first made his debut as a stunt actor. He worked as a stunt actor in more than 50 movies. Before he started his career as a stuntman, he worked as a carpenter in AVM studio for two years. 

Muthu Kaalai praises actor Prabhu, who introduced him as an actor. He says that Prabhu encouraged him to act in the films and comforted him to dub in his films. His first movie as a stuntman is through the Vijay starrer Kadhalukku Mariyadhai, which was released in 1997. Muthu got good chances to act as a stuntman in Sethu, Velai and many more films. As an actor, he was introduced in the film Ponmanam, directed by S. P. Rajkumar. Again, his next movie was with Prabhu in the film En Uyir Nee Thaane. His physique suits for the comedy roles very much. His career started as a fighter and continues as a successful comedian. Almost he has acted in 160 films, as a comedian. He has acted with all the popular comedy stars like Goundamani, Senthil, Vadivelu and Vivek. Muthu Kaalai wants to act as a solo comedian. He has acted in the popular films like Sivaji The Boss, Chandra Mukhi, Kireedam and M. Kumaran S/O Mahalakshmi. Muthu Kaalai is married and has a son.