The utility model relates to the technical field of insulation resistance detection. The insulation resistance detection device of the heating protective sleeve comprises a base, the device comprisesa box body and a motor, a motor is arranged on the inner side of the box body; the inner side of the box body is fixedly connected with a fixed plate; the inner side of the fixed plate is rotationallyconnected with a lantern ring; the left end of the lantern ring is fixedly connected with a water absorption roller; the left end of the water suction roller is fixedly connected with a cleaning roller; the tail end of a main shaft of the motor is fixedly connected with a first gear; the left end of the cleaning roller is fixedly connected with a second gear; the first gear is meshed with the second gear; the top end of the box body communicates with a water injection pipe; through the arrangement of the gear, the cleaning roller, the water suction roller and the spray head, the cleaning roller and the water suction roller can be conveniently used for cleaning the outer portion of the protective sleeve, the contact resistance is reduced, the correctness of a measurement result is ensured,and the device has huge economic benefits and wide market prospects and is worthy of application and popularization.