Protection method and protection device of air conditioner system

The invention provides a protection method of an air conditioner system. The method comprises the following steps that (1) the pressure value P0 inside an exhaust pipe of a compressor of the air conditioner system is detected; (2) P0 is compared with a first preset value P1; (3) when P0 is greater than P1, the operation of an outer fan of the air conditioner system stops. According to the protection method of the air conditioner system, the operation state of the outer fan is controlled through detecting the pressure value inside the exhaust pipe of the compressor of an outdoor unit, and the control on the pipe temperature of an indoor unit is realized, so the high-temperature-prevention protection on the air conditioner system is realized, the service life of the compressor of the air conditioner system is prolonged, the reliability of the whole machine unit is improved, and meanwhile, the after-sale fault rate of the air conditioner unit is also reduced. The invention also provides a protection device of the air conditioner system.