The invention is applicable to the technical field of automation of electric dispatching, and provides a testing method of lost SOE signal after circuit fault of an intelligent substation. The testingmethod includes steps of building a testing environment, wherein the testing environment includes a master telecontrol device when a site dismounting accident of the intelligent substation with failure is happened, two sets of CSI200E test control device and one set of CSC211 test protection device, a simulative background data device, a simulative monitoring background device; grouping the master simulative dispatching device to test, and setting the test control device and the test protection device according to the field parameter; performing clock synchronization on the device in the network by GPS in the manner of B code. The testing environment can reproduce a station end environment as much as possible. Through building the testing environment to test the telecontrol device, the testing result is real and reliable; the testing environment is built, and the detection work of the telecontrol device is carried out; thus the risk of carrying out testing work on the operating deviceto the power grid is avoided, and the safety and stability of the system running are improved.