The invention discloses a millimeter wave high-resolution imaging medium lens antenna design method. The method is a design method combining optical lens design technology and millimeter wave antenna design theory, relating to the technical field of a millimeter wave antenna. By using an optical lens curved surface, the wave aberration and the geometrical aberration of a system are optimized by an optical design method, so that -3dB light spot diameter of feed source antenna units on an object plane is the smallest, and the gain inequality value of each feed source antenna unit is smaller than 1dB. The design method has the characteristics of simpleness and easy use, and the resolution ratio of the millimeter wave lens antenna is innovatively defined. The design method provided can be applied to a millimeter wave imaging system.