The utility model provides a live replacement device for a discharge counter of a lightning arrester, and relates to the technical field of electrical measurement devices. The live replacement devicefor the discharge counter of the lightning arrester comprises a base, a telescopic assembly and a limiting assembly, one end of the telescopic assembly is connected with the base, one end of the limiting assembly is connected with the other end of the telescopic assembly, and the telescopic assembly can extend or retract to adjust the distance between the limiting platform and the base. And the other end of the limiting assembly is connected with a limiting platform, and the limiting platform is arranged between the lightning arrester and the lightning arrester discharge counter. The technicalproblem that in the prior art, workers can get an electric shock when a main device is electrified and a lightning arrester counter is replaced is solved. According to the limiting platform, a barrier can be formed between an operator and the lightning arrester, and electric shock of the operator is avoided.