The invention provides an automatic intelligent checking method for an intelligent substation, which belongs to the measurement field. A control unit, a power supply, a set of relay and a first test socket are combined to form a component A. A resistor matrix and a second test socket are combines to form a component B. Prefabricated cable plugs on both ends of a cable to be tested are respectively inserted into first and second test sockets. The control unit establishes the mapping relationship between the resistor matrix and the prefabricated cable plugs. On and off of each relay contact are sequentially controlled. The resistance of each cable core wire circuit to be tested is detected at the same time. On and off of each relay contact are controlled, and the level change of each relay port is detected. On and off of each core wire on both ends of the cable to be tested are determined. A diode is used to screen the connection sequence of each core wire of the cable to be tested on the prefabricated cable plugs to solve the problem of cable staggered wiring.