The invention discloses a method for testing conducting loop resistance of a generator circuit breaker. The method comprises the following steps of: (1) testing the conducting loop resistance by using a direct-current voltage drop method; and (2) improving the test current to test the conducting loop resistance. By increasing the step of improving the test current to test the conducting loop resistance after the conventional step of testing the conducting loop resistance by using the direct-current voltage drop method, the real contact state of a contact of the generator circuit breaker can be judged more accurately.