The invention provides a refrigerant filling component for an air conditioner and a refrigerant filling method. The refrigerant filling component for the air conditioner comprises a refrigerant supply pipeline, a refrigerant storage pipeline, a controller, a pressure sensor, a liquid pipe temperature sensor and an environmental temperature sensor, a first valve is arranged on the refrigerant supply pipeline, a first end of the refrigerant supply pipeline is connected with a first storage part for supplying refrigerants, a second end of the refrigerant supply pipeline is communicated with a filling port of the air conditioner, a second valve is arranged on the refrigerant storage pipeline, a first end of the refrigerant storage pipeline is connected with a second storage part for receiving the refrigerants, a second end of the refrigerant storage pipeline is communicated with the filling port of the air conditioner, the controller is respectively electrically connected with the first valve and the second valve, the pressure sensor is connected with a liquid pipe of the air conditioner and electrically connected with the controller, the liquid pipe temperature sensor is arranged on the liquid pipe of the air conditioner and electrically connected with the controller, and the environmental temperature sensor is electrically connected with the controller. The refrigerant filling component solves the problem that the system performance of the air conditioner is reduced due to errors of manual refrigerant filling in the prior art.