The invention relates to a device and method for repairing a dragging wheel of an elevator without disassembling. The device comprises a tool rest, an upper dragging plate, a middle dragging plate, a lower dragging plate, a support base moveable edge, a support base fixed edge and a support base baseboard, wherein the lower dragging plate is fixed on the upper part of the uprightly arranged support base moveable edge; the support base fixed edge is vertically arranged on the support base baseboard; the support base moveable edge and the support base fixed edge are spliced with each other; a height adjusting mechanism is arranged between the support base moveable edge and the support base fixed edge; a plurality of horizontal and upright mounting through slots are formed on the support base baseboard; and a rapid connecting mechanism which is fixedly connected to an elevator steel beam is arranged in the mounting through slots. The device and the method provided by the invention can beused for repairing the dragging wheel of the elevator without disassembling the dragging wheel, thereby shortening the time of repairing the elevator and promoting the efficiency of repairing the elevator.