The application discloses an air conditioning control method and device and an air conditioning unit with the same. A dual-PID (proportion integration differentiation) control mode is adopted for controlling the temperature of domestic hot water, air conditioning warm water and air conditioning cold water, the priority of a control object is determined according to the running mode of the air conditioning unit, a primary PID control algorithm is used for controlling the opening of a gas flow regulating valve according to a prior control object, a secondary PID control algorithm is used for controlling the opening of two condensation valves according to a non-prior control object, and meanwhile, different execution intervals and execution variables are set according to the two PID control algorithms, so that interference between the two PID control algorithms is avoided, the gas flow regulating valve and the two condensation valves are accurately controlled, and the temperature of domestic hot water, air conditioning hot water and air conditioning cold water is further stably controlled.