The invention discloses an air conditioner and a control method thereof. The air conditioner comprises a compressor, a heat interchanger, a heat exchanger and a radiation plate, wherein the radiation plate and the heat exchanger are connected through first and second ports of the heat interchanger; an air sucking end of the compressor is adaptively connected with a third port of the heat interchanger; an exhaust end of the compressor is adaptively connected with one of the heat exchanger and the radiation plate; a fourth port of the heat interchanger is adaptively connected with the other one of the heat exchanger and the radiation plate; and a pipeline between the first and second ports of the heat interchanger exchanges heat with a pipeline between the third and fourth ports of the heat interchanger. The air conditioner can overcome such defects as liquid shock of the compressor and weak heat exchange capacity caused by incapability of guaranteeing the air sucking superheat degree in the prior art, and achieves the beneficial effects of capability of guaranteeing the air sucking superheat degree, incapability of causing liquid shock of the compressor and excellent heat exchange capacity.