Disco Singh is the story of a struggling singer named Lattu Prasad (Diljit Dosanjh). Though his inspired parents named him "Lattu Prasad", there was nothing inspirational about his life but performing at marriages and parties for a living. Lattu is a failed singer, who runs an orchestra named "Disco Singh". He dreams of only two things - success and his girl friend Sweety (Surveen Chawla), a beautiful and successful model. Lattu is perpetually praying to god to send an angel who can make his dreams come true. And sure enough, God does send an angel. Bhupinder singh aka Paaji (Manoj Pahwa) a dreaded don, who is not really an angel but Yamraj. He asks Lattu to do a job for him & in return promises Lattu as much money as he desires. Thus begins Lattu's hilarious journey to woo Sweety, while also trying to save his life from Paaji. Things get complicated for Lattu and how he manages to escape from all his troubles, forms rest of this hilarious story.