Auxiliary dismounting tool for large motor

The invention relates to the technical field of large motors, in particular to a large motor auxiliary dismounting tool which comprises a tensioning mechanism which comprises a large motor, a driving shaft adaptively installed on the outer side of the large motor, a backrest wheel adaptively installed on the outer side of the driving shaft and a supporting component adaptively installed on the outer side of the driving shaft. The sliding component is adaptively mounted on the outer side of the supporting component; through mutual cooperation of the tensioning mechanism and the fixing mechanism, two installation modes can be selected in the connecting process of the pull rod and the backrest wheel, a worker can select a proper installation mode according to a specific construction site, and through extrusion of four friction blocks and the inner wall of a round hole of the backrest wheel, the friction blocks can be fixed to the inner wall of the round hole of the backrest wheel. Friction force generated by ext