Second Hand Husband is the story of a man who is in the process of divorcing his first wife and wants to marry his new girlfriend.
Rajbir (Gippy Grewal) is seeking a divorce from his vain wife, Neha (Geeta Basra). He has already fallen in love with lawyer Gurpreet (Tina Ahuja) and takes a marriage proposal to her family. Even while Gurpreet's brother (Ravi Kishan) is against the liaison, her father (Alok Nath) is in favour of it. But since Rajbir has been ordered by the court to pay Neha a monthly alimony of Rs. 30,000, Gurpreet's father is hesitant because Rajbir would be left with very little money for himself and Gurpreet.
Soon, Rajbir realises that he would not have to pay Neha alimony if she were to remarry. So, he takes it upon himself to get her a new husband. He takes advantage of the tension between his boss, Ajit Singh (Dharmendra), and his wife, Beant Kaur (Rati Agnihotri), because of his roving eye and drinking habit. While Beant Kaur applies for divorce, Rajbir tries to set up Ajit Singh with Neha. He even attempts to set up Beant Kaur with a police officer, Rakesh (Vijay Raaz), so that Neha could then marry Ajit Singh. Incidentally, Rajbir had also tried to get Neha interested in Rakesh but had failed.