The invention discloses an air conditioner heat pump system and a refrigerant charging control method and device thereof. The method includes the following steps that in the operation process of the air conditioner heat pump system, the exhaust temperature Tp, the exhaust pressure Pc and the exhaust superheat degree Td of the air conditioner heat pump system are obtained in real time, and the outlet temperature T3 of an outdoor unit heat exchanger and the outlet temperature T2B of an indoor unit coiled pipe are obtained in real time; when it is judged that the air conditioner heat pump systemlacks refrigerant according to Tp, Pc and Td, the air conditioner heat pump system is controlled to conduct rapid refrigerant charging; in the rapid refrigerant charging process, if it is judged thatthe air conditioner heat pump system meets a first preset condition according to Tp, Pc and Td, the relative supercooling degree Tg of the air conditioner heat pump system is calculated according to Pc, T3 and T2B, and Tg is judged; and if Tg is larger than the upper limit value of a preset supercooling degree interval, the air conditioner heat pump system is controlled to conduct precise refrigerant charging. In this way, charging of the refrigerant can be rapidly and precisely completed, and accuracy of the refrigerant in the system can be ensured.