Motor rotor dynamic balance testing device

The utility model discloses a dynamic balance testing device for a motor rotor, which adjusts and positions the position of a movable plate through a T-shaped groove, a movable frame, the movable plate and a positioning screw, so that the movable frame is arranged at a proper position, the length of a shaft body is met, and a workpiece to be tested is stably clamped; the shaft bodies with different diameters are adjusted and clamped through a matching plate, an adjusting bolt and a clamping arc plate, and after clamping, a driving motor electrically drives a connecting frame and a right side mounting cylinder to rotate, so that the right side mounting cylinder and a left side mounting cylinder stably rotate along a left side circular rail and a right side circular rail, and meanwhile, a rotor is driven to rotate; the rotor is located in the middle support during detection, the friction pads make contact with the rotor, rotation detection is carried out, the abrasion degree of the friction pads is observed aft