The invention discloses a combined heat pump system adopting trans-critical circulation and absorption heat pump co-production. A trans-critical compression subsystem comprises a compression unit, an air cooling unit, a throttling unit and an evaporation unit which are connected through working medium circulation. The air cooling unit is divided into a first heating pipe, a second heating pipe and an air cooling device in the flowing direction of a working medium, wherein the first heating pipe, the second heating pipe and the air cooling device release heat step by step and condense. A heat pump subsystem comprises a generator, a condenser, a first solution pump, a condensing evaporator, an absorber, a solution heat exchanger, a throttling device and a second solution pump. According to the system, by means of reasonable energy coupling, generation heat of the heat pump system comes from condensation heat of the trans-critical compression subsystem completely, a high-temperature heat source with the temperature of above 100 DEG C can be manufactured at the absorber only by inputting a small amount of electric energy, the system has the function of co-production of multiple kinds of energy, the performance coefficient is high when the electric energy is utilized for refrigerating and heating, and the whole system is simple in structure and low in manufacturing cost, and is economical.