Vincent Delgrosso, 26, alleges officers from the Staten Island Gang Squad pulled him from his car, threw him to the ground, pulled down his pants and sodomized him.
Delgross was arrested for possession of PCP.
According to the lawsuit, the officers threatened to shoot Delgrosso if he told any medical personnel what happened.
Delgrosso received medical treatment following his arrest and hospital records indicate he suffered rectal bleeding precipitated by trauma.
Photos released by attorney Richard Cardinale show Delgrosso with lacerations and bruises to his face and head as well as welts on his back.
The NYPD has not commented on the lawsuit.