The invention relates to an automatic testing system of a pseudorandom multi-frequency instrument receiver, comprising a controller, an LAN and a plurality of pseudorandom multi-frequency instrument receivers, wherein the controller is connected with the pseudorandom multi-frequency instrument receivers through the LAN; the controller comprises a testing task module, a management module, an analysis module and a display module; the testing mission module is used for establishing a testing task and sending task script information to a selected multi-frequency instrument receiver through the LAN; the management module is used for broadcasting handshake data packets to the LAN at certain times, recording received IP data packets in specified time and providing needed IP information for the testing mission module; and the analysis module obtains test results from the selected multi-frequency instrument receiver, carries out various data processes on the test results and utilizes the display module to display the test results. The automatic testing system can realize parallel automatic test of a plurality of receivers, thereby greatly improving the testing efficiency of the instrument.