Control method of cold-warm type air conditioner

The invention discloses a control method of a cold-warm type air conditioner. The cold-warm type air conditioner comprises a two-cylinder compressor, a commutation assembly, an outdoor heat exchanger, an indoor heat exchanger and a gas-liquid separator, wherein an air suction port of a first air cylinder communicates with a first liquid accumulator; the value range of the exhaust volume ratio of a second air cylinder to the first air cylinder is 1 to 10 percent; the commutation assembly comprises a first valve port, a second valve port, a third valve port and a fourth valve port; the fourth valve port is connected with the first liquid accumulator; the gas-liquid separator comprises a gas outlet, a first interface and a second interface; the gas outlet is connected with the second air cylinder; a first throttling element with an adjustable opening degree is connected between the first interface and the outdoor heat exchanger in series; and a second throttling element with a fixed opening degree is connected b