The utility model discloses a high-voltage disconnecting switch dynamic contact insertion stroke detection apparatus, comprising a cross bar, a push rod, and pulling plates. The middle of the cross bar is vertically penetrated by and provided with the push rod, and the push rod is connected with the cross bar through screw threads. The number of the pulling plates is two. The two pulling plates are arranged at the two ends of the cross bar and are arranged symmetrically with respect to the push rod. The end part of each of the two pulling plates is also provided with a first bolt which is parallel to the push rod. The end part of the push rod is connected with a U-shaped block which is rotationally fitted with the push rod. The U-shaped block is detachably connected with a connecting rod penetrating through the U-shaped block transversely. The first bolts are connected with a flange of the end part of a high-voltage disconnecting switch. The connecting rod in the U-shaped block is connected with a conducting rod which is connected with a dynamic contact in the high-voltage disconnecting switch. Then, the push rod is rotated to push the dynamic contact to move, and the insertion stroke length of the dynamic contact can be obtained by measuring the moving length of the push rod, thereby enabling the insertion stroke of the dynamic contact to be accurate and controllable, guaranteeing that the dynamic contact is accurately disposed in place, and ensuring that the working procedure does not generate discharge phenomena.