Refrigerant liquid level control method and device of heat pump unit and medium

The invention relates to the technical field of air conditioners, and aims to solve the technical problem of refrigerant liquid level adjustment in a compressor of a heat pump system at least to a certain extent. In order to achieve the purpose, the refrigerant liquid level control method and device of the heat pump unit and the computer readable storage medium are provided, the heat pump unit comprises a compressor, the compressor comprises a plurality of machine heads, and the refrigerant liquid level control method of the heat pump unit comprises the steps that according to the refrigerating/heating requirement of the heat pump unit, the refrigerant liquid level of the heat pump unit is controlled; whether the compressor needs to be subjected to machine head increasing/decreasing operation or not is judged; and if yes, the current refrigerant liquid level of the compressor is adjusted before, at the same time or after the operation of increasing/decreasing the machine head of the compressor. Through the st