The utility model belongs to the technical field of electrical equipment. The utility model provides a silicone rubber protective cover for a lightning arrester. The lightning arrester protection cover comprises an L-shaped protection cover body, the protection cover body is composed of a lightning arrester protection part and a wiring end protection part, a lightning arrester clamping opening isformed in the bottom end of the lightning arrester protection part, a cable sealing section is arranged at the end, away from the lightning arrester protection part, of the wiring end protection part,and a cable clamping opening is formed in the tail end of the cable sealing section; the inner side of the protective cover body is in a separated state from the lightning arrester clamping opening to the cable clamping opening; wherein a first connecting skirt and a second connecting skirt which correspond to each other are arranged on the edges of the two separated sides respectively, a clamping groove is formed in the first connecting skirt, a clamping strip matched with the clamping groove is arranged on the second connecting skirt, and the first connecting skirt and the second connectingskirt are connected in a sealed and buckled mode through the clamping groove and the clamping strip. According to the utility model, effective insulation protection of the wiring end of the lightningarrester wire is realized, operation faults or casualty accidents caused by electrical contact exposure are avoided, and the practicability is strong.