A high-performance universal multi-channel radar system comprises a millimeter wave short-range imaging high-frequency front-end assembly, an intermediate frequency processing assembly, a data acquisition assembly, a comprehensive signal processing assembly and a microwave source assembly. The high-frequency front-end assembly comprises a radio frequency and local oscillator signal generation module, a signal distribution and calibration network module, an antenna and a radio frequency channel array module, and realizes generation of radio frequency and primary local oscillator signals, and reception, amplification, filtering and primary down-conversion of echo signals. The intermediate frequency processing assembly realizes amplification, filtering and secondary down-conversion of echo signals. The data acquisition assembly is used for realizing echo signal acquisition and signal preprocessing. Real-time imaging of echo data is achieved through the comprehensive signal processing assembly. The microwave source assembly realizes generation of a clock reference signal, a synchronous signal and a secondary local oscillator signal. Resource waste caused by repeated design and development under same requirement or similar requirement is avoided, the design efficiency is effectively improved, and universality and flexibility are enhanced.