The utility model relates to a tester, which is particularly applicable to testing of an arc suppression coil compensation device. At present, a plurality of transformer substations are provided with automatic arc suppression coil compensation devices, but third-party monitoring measures for operating states of the devices are lacked except for operation indicating signals provided by manufacturers. The tester for the arc suppression coil compensation device comprises an output end and an input end which are connected with a central processing unit, wherein the output end comprises a zero-sequence voltage signal module, a zero-sequence current signal module, a network voltage signal module and a tap position signal module, the input end comprises a tap position adjusting signal module and a damping resistance control signal module, and the central processing unit is respectively connected with a power module, a human-computer interface module and the like. The tester provides a testing measure for the automatic arc suppression coil compensation device, and safety operation of a power network is ensured.