Antenna index computing method and device

The invention discloses an antenna index computing method and device. The antenna index computing method comprises the following steps of: testing a system under test, and obtaining the weight value testing data of the system under test; setting the amount of discrete points in a wave beam amplitude directional diagram to be generated, uniformly distributing the discrete points, and computing azimuth angles and steering vectors of the discrete points; computing power values to which the discrete points correspond in different polarization directions according to the weight value testing data, and superposing the power values of the discrete points with the same azimuth angles; and generating the wave beam amplitude directional diagram according to the set discrete points and the superposed power values of the discrete points, and computing a main lobe width index value and side lobe graining index values of antenna beams according to the wave beam amplitude directional diagram. According to the antenna index