Phase sequence detection device and method, and air conditioning equipment

The invention discloses a phase sequence detection device and method, and air conditioning equipment. The device comprises a detection circuit and an MCU. The detection circuit comprises: an indication unit which is connected between a first phase of a three-phase power supply and the zero line of the three-phase power supply and is used for indicating the conduction condition of the first phase;a first detection unit, wherein the input end of the first detection unit is connected between the second phase and the zero line of the three-phase power supply; and a second detection unit, whereinthe input end of the second unit is connected between the third phase and the zero line of the three-phase power supply, and one of the connection ends of the input ends of the first detection unit and the second detection unit are connected with the first phase of the three-phase power supply. The input end of the MCU is connected with the output ends of the first detection unit and the second detection unit. According to