The invention relates to a liquid impact preventing device of a compressor, in particular to a supercooling liquid impact preventing device of an air cooling heat pump air conditioner, comprising a liquid outlet pipe of a condenser, the condenser, an exhaust pipe of a compressor, a liquid outlet pipe of a liquid pump, the liquid pump, an input pipe of a liquid pump, the compressor, a gas suction pipe of the compressor, a gas-liquid separator, a gas inlet pipe of the gas-liquid separator, a controller, a first liquid level sensor and a second liquid level sensor, wherein the liquid outlet pipe of the condenser, the condenser, the exhaust pipe of the compressor, the compressor, the gas suction pipe of the compressor, the gas-liquid separator and the gas inlet pipe of the gas-liquid separator are connected in sequence. The invention has the advantages that liquid is pumped to the condenser when the liquid in the gas-liquid separator is overmuch so that a refrigerant at the bottom of the condenser is supercooled, and the condition that the liquid refrigerant is absorbed in the compressor to cause liquid impact is prevented; the size of the gas-liquid separator is reduced, and the manufacturing material and the space are saved; and the supercooling liquid impact preventing device of the air cooling heat pump air conditioner is simple in installation and easy for production operation.