Speed reducer machining device facilitating auxiliary dismounting and mounting

The utility model relates to the technical field of disassembly and assembly of speed reducer machining devices, and discloses a speed reducer machining device facilitating auxiliary disassembly and assembly, which comprises a device main body and a disassembly and machining mechanism. According to the speed reducer machining device facilitating auxiliary dismounting and mounting, by starting a driving motor in the dismounting machining mechanism, the driving motor drives a driving screw rod to rotate immediately, the driving screw rod drives a movable rod to move inwards immediately, and then the movable rod drives a transfer axis to move inwards synchronously; the switching shaft center drives two sets of switching shaft rods connected with the switching shaft center to synchronously move towards the inner side, the switching shaft rods compress buffer spring assemblies, through supporting of the two sets of switching shaft rods, the stability of work of movable rods every time is guaranteed, the movable ro