According to the requirement of radar signal radiation environment for the calibration of certain type radar counter system, a multifunctional radar signal generator which used digital signal processing (DSP) technology and field programmable gate array (FPGA) technology is designed. By optimizing algorithm of in-pulse characteristics, repetitive frequency features and agile characteristics for multiple radar signals, 12 different radar signals can be quickly and accurately simulated. Test of analog radar signal and pulse radar signal generated by simulator show that the signal generator has the characteristics of high precision, high speed, strong reliability, and good flexibility.