The invention relates to an automatic test system of T/R (Transmitter and Receiver) assemblies, and belongs to the technical field of radar detection devices. The system comprises a frequency synthesizer, a waveform generator, a four-in-one receiver, a communication controller, an autonomous software, and the like. The waveform generator is a direct digital synthesizer DDS. A clock signal source of the frequency synthesizer provides a working clock of 15MHz for the waveform generator, the communication controller, and an analog-to-digital converter. A local oscillator signal source provides local oscillator signals of the four-in-one receiver. An excitation signal source is used for providing an excitation signal and an analog echo signal for a tested T/R assembly through a through end ofa directional coupler and coaxial switches S1-S9. The excitation signal source provides a test signal for the tested T/R assembly through a coupling end of the directional coupler and a first power divider, and provides a reference signal for the system for system calibration. According to the automatic test system of the T/R assembly, switching of all channels and frequency points, data storage,calculation, and correction value writing can be automatically completed; human intervention is reduced; occupied instruments are few; the test is high in quality and efficiency; and the operate and maintain are convenient to be performed.