The invention relates to the field of security guarantee of an electrical power system, in particular to a breaker matching method for restraining self-excitation of the electrical power system. The breaker matching method comprises using a mutual inductor in the electrical power system and a signal collecting device to collect the voltages of U1 and U 2 of buses on two sides of a link circuit in real time, and the quantity of the opening and closing state of breakers on two sides of the circuit and a system relay protection tripping order for being used as output amount and the like. Combined strategies such as combination jump, delay later jump and overvoltage tripping of the breakers are used for controlling the breakers on two sides of a call wire between a small network and a main network, so that the condition that the small network and a long call wire are connected and form an isolated network is avoided, or the continuous time of the condition is reduced to the greatest extent. A last defense line is arranged when overvoltage happens in the system, the small network is broken off timely, and so that the purposes of restraining the self-excitation and protecting devices in the system are achieved. Needless devices do not need to be added, and the breaker matching method for restraining the self-excitation of the electrical power system has the advantages of being low in cost, simple and convenient to operate and the like.