The invention discloses a method for testing secondary equipment of an intelligent substation. The output of a testing system is used to replace the output of a mutual inductor to be output to the secondary equipment. An SCD file of the transformer substation is read and analyzed, and a structure level diagram of the intelligent substation is generated. The messages of different working conditionsare analyzed to monitor the operation state of the secondary equipment. The equipment faults are positioned, fault automatic maintenance is carried out, and finally a function correlation library instantiation model of the relevant transformer substation is built. By the adoption of the method, the testing of the secondary equipment of the intelligent transformer substation with high safety, highstability and high integrity can be realized.