The utility model relates to the technical field of cabinets. The wall-mounted power supply system comprises a power supply module, the cabinet comprises a cabinet body and a cabinet door, the cabinetbody is hinged to the cabinet door through a hinge piece. A mounting frame is fixedly mounted in the cabinet body; a primary power-off switch, a secondary power-off switch, a battery switch and an alternating-current switch are fixedly mounted on one side surface of the mounting frame in sequence from left to right; the primary power-off switch and the secondary power-off switch are electricallyconnected with the battery switch through the copper bar assembly. A plurality of battery supporting plates which are arranged at intervals and are used for storing battery packs are arranged below the mounting frame; the battery supporting plate is fixedly mounted in the cabinet body; a battery baffle is fixedly installed at the end, close to the cabinet door, of the battery supporting plate. Thebattery switch is electrically connected with the battery pack stored on the battery supporting plate, the cabinet door is further fixedly provided with a monitoring module and a rectifying module, the monitoring module and the rectifying module are both electrically connected with the primary power-off switch or the secondary power-off switch, the structure is simple, and the problem that an existing power supply system is complex in structure is solved.