The invention belongs to the technical field of mechanical design, and particularly relates to a nuclear power plant reactor main pump overhaul rack. The nuclear power plant reactor main pump overhaulrack comprises a rack bottom layer, a rack first layer, a rack second layer, a rack thick layer and a staircase, wherein the rack first layer is fixedly arranged above the rack bottom layer and is fixed by fulcrums of the rack first layer in a main supporter; the rack second layer is fixed through a support flat plate of the rack second layer in the main supporter; and support upright posts are arranged above the rack second layer and are used for fixing the rack third layer. The whole overhaul rack realizes the vertical passing function of overhaul workers through the staircase. The nuclearpower plant reactor main pump overhaul rack has the advantages that the personnel and object falling possibility can be avoided; and the personnel and equipment safety is improved.