The invention provides a refrigerant transfer method and device and relates to the technical field of air conditioners. The method comprises the following steps: firstly, acquiring identity information of failure outdoor unit modules; then controlling four-way valves included in the failure outdoor unit modules to be in an electrified state and four-way valves of normal outdoor unit modules exceptthe failure outdoor unit modules to be in a power down state; acquiring the internal pressure values of the failure outdoor unit modules after working for a period of time; and if the pressure valueof each of the failure outdoor unit modules is smaller than or equal to a preset pressure value; closing a refrigerant valve included in a failure outdoor unit, and controlling the failure outdoor unit modules and the normal outdoor unit modules to stop working. According to the refrigerant transfer method and device provided by the invention, waste of the refrigerant is not caused when the failure outdoor unit modules are maintained, the maintenance cost is saved, and meanwhile, the environmental pollution is reduced.