Room air conditioner and control method thereof

The invention provides a room air conditioner and a control method thereof. The room air conditioner comprises a first circulation loop, a second circulation loop, an indoor fan and an outdoor fan; working media of the first circulation loop and the second circulation loop exchange heat through a heat exchanger; the first circulation loop comprises a first compressor, a first four-way reversing valve, a first indoor heat exchanger, a first electronic expansion valve, a first passage of the heat exchanger, a second electronic expansion valve and a first outdoor heat exchanger which are connected; the second circulation loop comprises a second compressor, a second four-way reversing valve, a second indoor heat exchanger, a third electronic expansion valve, a second passage of the heat exchanger, a fourth electronic expansion valve and a second outdoor heat exchanger which are connected; and the first electronic expansion valve, the second electronic expansion valve, the third electronic expansion valve and the