The invention relates to an electrical detection device for an insulated pull rod, which comprises a detection unit, a detection voltage introducing unit and a transferring unit, wherein the detection unit comprises a detection tank and at least two joints; the detection voltage introducing unit is used for introducing detection voltage; the transferring unit comprises a connection arm and a switching mechanism; and the switching mechanism can switch connection between the connection arm and the joints. According to the above electrical detection device for the insulated pull rod, as the transferring unit is arranged, connection between the detection voltage introducing unit and a joint arranged on any of the insulated pull rods in the detection tank can be switched through the transferring unit, and thus, after one insulated pull rod is detected, the next insulated pull rod can be switched directly, and detection on the next insulated pull rod can be directly carried out. Multiple insulated rods can be detected through one-time mounting, the electrical detection process is simplified, and the detection efficiency is improved. The invention also discloses an electrical detection method for an insulated pull rod.