The present invention discloses an insulation detection device, belonging to the electric power maintenance and detection device technology field. The device comprises a megohmmeter and a detection mechanism; the detection mechanism comprises a frame, a lead screw, a nut, a detector and two brackets configured to support electroscopes; the brackets are fixed at two ends of the frame; the lead screw is connected with the frame and is in spiral matching with the nuts; the detector is connected with the nut, and the detector and the nut are translated with the rotation of the lead screw; the detector comprises a detection plate and two detection rings, and the detection plate of the detector is connected with the nut; the detection plate is formed by insulation materials; the detection rings are the annular structures adaptive to the insulation rods of the electroscopes and are formed by conductive materials; the two detection rings are fixed in parallel on the detection plate, and the two detection rings are respectively connected with two work ends of the megohmmeter; and the rotation shaft of the swing handle of the megohmmeter is connected with the input shaft of the lead screw of the detection mechanism. The insulation detection device is simple in structure and convenient in operation, and realizes that only one operator can perform operation to complete the insulation performance detection of the insulation rods of the electroscopes.