The invention discloses a maintenance auxiliary device for devices in a hydropower station. The maintenance auxiliary device comprises a fixing rack, a first support frame, a handle, a bottom plate, universal wheels, a seat, a guide rail, a rechargeable battery, a sliding part, hanging holes, an illuminating lamp, a second support frame, a tool box, a baffle plate, a working table and a garbage storage cabinet, wherein the garbage storage cabinet is arranged on one side of the bottom plate; the guide rail is arranged at the top end of the bottom plate; the seat is arranged in the guide rail; the tool box is arranged at the upper part of the second support frame; the illuminating lamp is arranged on one side of the tool box; the hanging holes are formed in the upper part of the baffle plate; and the rechargeable battery is arranged at the lower part of the second support frame. The maintenance auxiliary device for the devices in the hydropower station can operate in different environments, the space in the maintenance auxiliary device can be reasonably arranged, and the maintenance auxiliary device has the functions of illumination, maintenance tool storage and hanging, working table height adjustment, seat position moving and garbage storage, can be conveniently moved to a device requiring to be maintained, and is more convenient to use.