Torque boosting device for impact tool

The invention provides a torque enhancing device for an impact tool, which comprises a rotating main shaft with a first end and a second end which are opposite to each other, the first end of the rotating main shaft is configured to be detachably connected with a driving end of the impact tool, and the rotating main shaft is provided with an inertia flywheel which approximately extends outwards in the radial direction and is close to an input end. The torque enhancing device further comprises a sleeve capable of being arranged at the second end of the rotating main shaft in a sleeved mode, the second end of the rotating main shaft can move in the sleeve in the direction of the rotating axis, and the bottom end of the sleeve is configured to be detachably connected to a fastener or the output end of a rotating sleeve of the fastener. And aiming at the occasion that the fastener needs to be loosened with larger initial torque, the rotating inertia of the impact type tool can be greatly increased, and the fasten