The invention provides a method for testing travelling wave fault location devices in a power system. The method is characterized by comprising the following steps based on the type A travelling wave fault location principle: obtaining testing reference data; inputting the testing reference data into a travelling wave fault location device tester, using the travelling wave fault location device tester to convert the testing reference data to analog current magnitude and replay the analog current magnitude to travelling wave fault location devices to be tested to obtain the fault location result L'; and comparing L' with the distance corresponding to the testing reference data and indicating that the travelling wave fault location devices to be tested are qualified if the error is smaller than the set threshold, and otherwise indicating that the travelling wave fault location devices to be tested are unqualified, thus realizing testing of the travelling wave fault location devices. The method has the following beneficial effects: testing can be completed in the substation at one side of the circuit; only a travelling wave fault location device tester is needed and the global positioning system (GPS) satellite time synchronization device is not needed for check once; and the fault location accuracy is ensured; and the work efficiency is improved, the manpower resources are saved and the testing equipment investment is reduced.