The utility model discloses an electric power adapter, the owner who including the base, all sets up on the base connects and the secondary joint of a plurality of, the female joint includes female first shell, sets up the wiring structure in the first shell of mother, female first shell passes through the screw fixation to the base, the wiring structure includes the casing, inserts the conductive component of establishing in the casing, the conductive component passes through the wire with the secondary joint of a plurality of respectively and is connected, the conductive component includes the fixed column, inlays a plurality of conducting rod of establishing in the fixed column, be equipped with the short circuit structure of carrying out adjacent conducting rod the short circuit in the fixed column. The utility model discloses an electric power adapter through the mainly setting of joint and secondary joint, just can be connected to a plurality of current transformer on the check out test set, and has passed through the setting of short circuit structure in effectual realization, just can realize the in -process at plug current transformer, and current transformer can not appear opening a way and lead to the problem of incident.