The invention discloses a broadband multi-way radar signal comprehensive simulation system and a working method thereof. Through utilization of embedded software, various waveforms are customized in awaveform generator; initial signal frequencies are formed; through multi-way up conversion, synthesis is carried out in two-way synthesizers, signal powers are amplified through utilization of a broadband power amplifier, and signals are transmitted to antennas through utilization of transmission lines and then are radiated. According to control equipment, computer operation software controls a host to work based on a selected program, single-way radar waveform output can be carried out, and multi-way multi-waveform radar signal output also can be carried out. Whether to output each radar signal or not is controlled through utilization of a switch, and a condition for ordered transmission of battle simulation is provided. According to the broadband multi-way radar signal comprehensive simulation system provided by the invention, the waveform, a repetition frequency, a working frequency and output on-off of each radar signal can be set, an effect is vivid, a practical range is wide. The problems of radar signal comprehensive simulation and full band radio frequency signal radiation in the prior art are effectively solved.