The utility model discloses a drop out fuse tests electric earthing device, including insulating magnetism spare, no. Two insulating magnetism spare, drop out fuse, test electric ground loop and carry a between appearance, be equipped with the link rod between insulating magnetism spare and the two numbers insulating magnetism spare tops, one number insulating magnetism spare upper end is equipped with the seat of being qualified for the next round of competitions one number, two numbers insulating magnetism spare upper end is equipped with the seat of being qualified for the next round of competitions two numbers, drop out fuse is connected to the link rod below, between the drop out fuse lower extreme connect to carry holds, and carry hold between the lower extreme connect and test electric ground loop, it is equipped with the detection record appearance in both sides within a definite time to carry the appearance. The utility model discloses making the maintenance personal can directly carry out drop out fuse's maintenance or change, having practiced thrift manpower and material loss greatly, more comprehensive when an insulating magnetism spare being equipped with and two numbers insulating magnetism spares can be guaranteed to overhaul, the detection record appearance that is equipped with can be convenient for take notes the time of detecting last time, and overhaul the next time of being convenient for.