Hot backup switch cabinet

The utility model belongs to the technical field of batteries in the data industry, and particularly relates to a spare part charging device which comprises a switch cabinet body and a main circuit charging device arranged in the switch cabinet body, the main circuit charging device is used for charging a storage battery pack, a spare part bin is constructed in the switch cabinet body, and the spare part charging device is used for charging spare parts. The spare charging device is connected with the main circuit charging device; under the normal condition of the mains supply, the main circuit charging device is powered on and enables the storage battery pack to be in a floating charge standby power state, and the standby charging device takes power from the main circuit charging device and performs floating charge supplementary power on the standby storage battery. A switch cabinet body is modified, a spare part bin used for specially placing spare part batteries is designed, for energy storage batteries of