Mohan (Shammi Kapoor) is unhappy because of too much wealth and his chum Anokhe (Mehmood) is unhappy because of over-whelming poverty. They willing change places in order to live the life they dream of. But life is not a bed of roses. They have to wage a perpetual battle of wits with Mohan's parents and Anokhe's disciplinarian guardian.
What they do to ward off near disaster is a riotous fun, which is bound to make even a most seriously minded saint laugh his guts out. Further complications arise when Mohan falls in love with a poor working girl and Anokhe seeks solace in the arms of an ex-jailor's daughter.
Climaxing the drama of willingly exchanged identity of these two imposters there arrives on the scene a third man who looks exactly like Anokhe. To add fire to the fun and amusing complications, this man is married to a dominating shrew, who does not hesitate even to chastise physically anyone she believes to be under the influence of a ghost.
In fine, "DIL TERA DEEWANA" is a life-time entertainment, the sheer memory of which will delight cinegoers as long as they live.
It provides 15,000 laughs in 150 minutes.
(From the official press booklet)