The invention provides an automatic selection method for phase selection control strategies of intermediate circuit breakers under a 3/2 connection mode. For application in phase selection opening and closing control occasions with controlled intervals of different load properties, phase selection control equipment presets an inductive load phase selection control strategy, a capacitive load phase selection control strategy, a synchronous closing control strategy and a phase selection invalid control strategy, and intelligent phase selection control on the intermediate circuit breakers is achieved through collecting position signals of circuit breakers associated with the intermediate circuit breakers and phase selection reference voltage signals of buses and automatically selecting the phase selection reference signals and the control strategies according to the current operation condition of a system. The problem of double-branch phase selection control of the intermediate circuit breakers under the 3/2 connection mode is effectively solved by using single phase selection control equipment through automatic selection of the phase selection reference signals and the control strategies, the intelligent degree and the application flexibility of the phase selection control equipment are improved and the configuration and maintenance cost of the system is reduced.