The invention discloses a repair device for a building construction connecting hole and a use method thereof. The repair device is stuffed in the connecting hole, salient points in the connecting holeare rubbed and removed through rotation of a movable repair block, and the repair efficiency of the connecting hole in building equipment can be effectively improved. The repair device is characterized in that two thread bushings are disposed at the two ends of a supporting plate separately, and bolts penetrate through the thread bushings and are in screw thread fit with the thread bushings; eachconnecting plate is disposed at one end of the corresponding bolt and provided with a suction cup; a fixed plate is arranged in the middle of one side of the supporting plate and is of a U-shaped plate structure, a driving motor is arranged on the fixed plate, one end of a transmission rod is connected with one end of a motor shaft of the driving motor through a connecting sleeve, and the other end of the transmission rod penetrates through the middle of the supporting plate through a fixed bearing; and a rotor is in a circular truncated cone shape, the big end of the rotor is disposed at theother end of the transmission rod, and at least two sliding grooves are symmetrically formed in the outer side of the rotor.