The invention discloses a wireless isolation type power line carrier communication performance test method. The method comprises the following steps that a PC and a programmable attenuator are poweredon;, a serial port is opened; serial port and wireless communication parameters are configured to establish communication connection; an accompanying test module and a tested module are powered on; the wireless connection is established; the accompanying test module, the tested module and the programmable attenuator are all powered by a UPS; a table address parameter is configured; if the testedmodule is a single-phase table module or a three-phase table module, an address request frame is sent through a module serial port after the tested module is powered on, and an address corresponding to the request is responded after the PC receives the request; the frequency band parameters of the tested module are set; the test data frame are sent; whether the communication of the test data frameis successful or not is judged; the attenuation value is automatically adjusted in the communication process, and the PC determines the anti-attenuation performance of the tested module by counting the communication success rate. According to the invention, physical isolation is realized, and the system stability is improved by using wireless communication and the UPS power supply.