Hadh Kar Di Aapne is a story of a father and son who are played by the same actor. The son is a divorce lawyer and the father is a private detective. The son disguises himself as his father to solve a case involving a massage parlor. Along the way, he impersonates various characters and gets involved in a series of comedic situations. The plot takes a twist when the son has a change of heart and tries to help a friend who is in love. The movie includes elements of romance, as well as comedy.

Raju is a poor guy who wants to marry a rich girl. Her father challenges Raju to earn ₹10,000,000 within a year to prove himself first.

Kishan Oberoi has three sons - Dilip, Ashish, and Raj. While Dilip and Ashish are married, Raj (Govinda) is in love with Meena. Kishan does not trust his two elder sons, but trusts Raj, and Raj in turn, is devoted to his dad. One day Raj loses his mind in an accident, and the two elder brothers begin a conspiracy that includes the death of their dad, and the disinheritance of their brother Raj, by declaring him mentally incompetent. Raj mysteriously disappears, and Kishan falls off a building; Murari, a greedy employee of the Oberoi family, brings in a look-alike of Raj, namely Banne Khan (also Govinda), and his wife, Salma Khan, who poses as his nurse, so that Banne Khan and Murari both rule over the Oberoi family, and reap the benefits.