The invention relates to the technical field of substation equipment inspection, disclosing a spare power automatic switching logic test method for checking an automatic switching mode of a low-pressure side section switch. The test wire of a tester is accessed and the initial state of the experiment begins; experiment switches AN1 to AN4 are pushed to conduction positions; manual operation simulation breaker modules 1DL, 2DL, 3DL and 4DL are set to be in a close state; the operation of the automatic switching device is detected; the simulation breaker modules 1DL, 2DL, 3DL and 4DL are disconnected; the simulation mutual inductor acts; and the tested device can operate if the space automatic switching logic function can correctly conform to the requirement. The spare power automatic switching logic test method can be used for simulating the space automatic switching function of 10KV bus bar spare switching in the space automatic switching, is convenient to measure the protective constant value of the spare power automatic switching protection device and is convenient to operate, and the result is reliable. The inspection routine of the spare power automatic switching device of inner bridge wiring of a power system can be satisfied, the test flexibility can be greatly improved, and the production efficiency is improved.