The invention discloses an other vector rotation calibration method for a phased array antenna, and aims to provide a calibration method which has high practical amplitude value testing accuracy and can be used for effectively avoiding repeated introduction of errors in a phase shifting state. The method can be implemented through a scheme consisting of the following steps of: setting a phased array antenna of an N unit and an other vector rotation calibration system, setting a phased array antenna branch consisting of a wave beam forming network in the system and a TR assembly comprising a phase shifter as a calibration object, performing phase shifting on an antenna phase shifter by using a wave controller connected between the tail end of the RT assembly and an amplitude phase receiver, and testing a complex signal reaching the amplitude phase receiver and an amplitude phase value in each phase shifting state through a calibration amplitude phase receiver connected with the initial end of the antenna unit and the wave beam forming network; and acquiring the initial phase and amplitude distribution of each feed branch through other vector rotation, obtaining the amplitude phase error of each feed branch by using an other vector rotation calibration algorithm, and correcting parameter differences to realize calibration of the phased array antenna.