The invention relates to an interference direction method based on orientation deviation and belongs to the technical field of radar array signal processing. The method includes 9 steps with hardware including a TS201 type digital signal processing DSP chip and the software including a Visual DSP++software. The method increases orientation deviation value reading in for interference amplitude data that are read by the DSP chip, optimizes the usage of the orientation deviation value to obtain possible orientation of the interference, and determines the detailed orientation of the interference by assessing whether an interference amplitude is higher than an interference threshold. The method can clearly identify and differentiate two or a plurality of interferences having smaller separation angles, is easy to operate, and can at the same time indicate detailed direction on a terminal interface of a radar with a dotted line. The method overcomes the problems of current methods for measuring interference angles by selecting the maximum direction module value of the interference, such as failure of clearly identifying and differentiating a plurality of interferences having smaller separation angles, failure to indicate detailed direction on the terminal interface of the radar, and susceptibility to influence on the precision of interference direction angle of radar measuring.