A combined air handling unit driven by a total heat recovery type heat pump comprises a compressor, a high-voltage switch, a four-way reversing valve, a refrigerant three-way solenoid valve, a heat source side evaporating/condensing device, three-way joints, a bridge type loop in which four refrigerant non-return valves are arranged, and a high-voltage reservoir, a drying filter, the refrigerant non-return solenoid valves, the three-way joints and an expansion valve which are serially connected in the bridge type loop, and two refrigerant non-return valves connected with a outlet three-way joint of the expansion valve in the bridge type loop, wherein an inlet of the refrigerant non-return valve flowing to the refrigerant side of the heat source side evaporating/condensing device is in series connection with the refrigerant non-return valve in the same direction, and the other side of the bridge type loop is connected with the refrigerant side of an evaporating/condensing device of a driving cold-hot coiler, the four-way reversing valve, a gas-liquid separation device, a low-voltage switch and the compressor to form a heat pump loop. The combined air handling unit is driven by the total heat recovery type heat pump so as to completely solve the problem of refrigerant accumulation in a stopped heat exchanger and fulfill various functions of dehumidifying in summer, drying, air-conditioning in summer, heating in winter, defrosting in winter and the like, and other heat sources are not needed, so that the primary investment of the unit is reduced.