The invention discloses an air conditioner electronic expansion valve coil wire sequence detection method, a detection device, a detection system and an air conditioner system. The electronic expansion valve coil wire sequence detection method comprises steps: the variation of an opening of the electronic expansion valve in a preset time is acquired; the exhaust temperature and the exhaust pressure of a compressor of the air conditioner in the preset time are recorded; and according to the variation of the opening of the electronic expansion valve and the variation conditions of the exhaust temperature and the exhaust pressure of the compressor of the air conditioner, the effectiveness of the coil wire sequence of the electronic expansion valve is judged. Judgment on the effectiveness of the coil wire sequence of the electronic expansion valve of the air conditioner can be realized, the phenomenon that the operation of the air conditioner system deviates from the normal state caused by improper opening control of the electronic expansion valve can be avoided, and the air conditioner operation reliability is improved.