Four-in-one air-cooling heat pump unit

The invention belongs to the technical field of refrigeration and air-conditioning, in particular to a four-in-one air cooled heat pump unit for refrigeration, heating and domestic hot water. A water side heat exchanger and an air side heat exchanger can be used as a condenser or an evaporator, a regenerator can be used as the condenser, and a four-way valve and magnet valves are used for assistance and combined in one direction to form the air cooled heat pump unit with four function, and the four functions are: 1, refrigeration; 2, the refrigeration and total heat recovery; 3, independent domestic hot water; and 4, heating. The heat pump unit can realize the total heat recovery of the hot water during the refrigeration. The hot water produces heat without any expenses. The heat pump unit can produce the hot water all the year around to solve the problem that a use side of an air conditioner cannot produce the hot water when not being used.