The utility model relates to a totally-enclosed-type vehicle-mounted mobile transformer station comprising a platform trolley, and a high-voltage control cabinet, a transformer and a low-voltage control cabinet which are arranged on the platform trolley. The high-voltage control cabinet, the transformer and the low-voltage control cabinet are arranged on the platform trolley in turn from the front to the back. An inlet wire of the high-voltage control cabinet adopts an inlet wire cable plugging head. The high-voltage control cabinet and the high-voltage side of the transformer are connected by adopting a metal enclosed switch. The low-voltage side of the transformer and the low-voltage control cabinet are connected by adopting the cable plugging head. An outlet wire of the low-voltage control cabinet adopts an outlet wire cable plugging head. Connection of the high-voltage side adopts an oil gas sleeve tube, and the inlet and outlet wires adopt the cable plugging heads so that the electrified part exposed in the air is reduced, interference of environment is reduced and operation reliability and safety of the totally-enclosed-type vehicle-mounted mobile transformer station are greatly enhanced.