The invention discloses a superconducting current limiting liquid nitrogen switch combined electric appliance and a working method thereof. The combined electric appliance comprises a vacuum heat insulation Dewar cabinet body, a superconducting current limiting unit, a liquid nitrogen breaking unit and a liquid nitrogen circulation cooling system, wherein the vacuum heat insulation Dewar cabinet body is filled with liquid nitrogen, the superconducting current limiting unit and the liquid nitrogen breaking unit are co-located inside the Dewar cabinet body, and the two units are isolated by a vacuum heat insulation layer and electrically connected; the superconducting current limiting unit includes a superconducting tape bracket and a superconducting tape; the liquid nitrogen circulation cooling system includes a liquid nitrogen pump, a heat exchanger, a liquid nitrogen storage tank and a refrigerator; and the liquid nitrogen breaking unit includes static and moving contacts, an operating mechanism, a pressure release nozzle, a liquid nitrogen storage tank, a liquid nitrogen pump, a nitrogen storage tank and a pressurizing pump. The combined electric appliance reduces the fault current by using quench characteristics of the superconducting current limiting unit when the circuit fails, and breaks the fault current by using good insulation characteristics and good current breakingcharacteristics of liquid nitrogen; and the combined electric appliance realizes the integration of current limiting and breaking, shares the refrigeration system, saves the cost and reduces the volume of the equipment.