High-performance lithium battery is used for power supply of the equipment, which is configured with 3-channel linear adjustable current and 4-channel linear adjustable voltage output. 7-inch touch screen is selected and equipped with a new operation interface. On the basis of retaining the test function module and high-precision output of traditional relay protection tester, the structural design is optimized, the volume and weight are reduced, and the single handset operation is convenient. It is especially applicable to the test scene that needs to be moved and the work efficiency is improved.