Railway signal cable insulation test method

The invention provides a railway signal cable insulation test method. The railway signal cable insulation test method is applied to a railway signal cable insulation test system, and the railway signal cable insulation test system comprises a control module, M groups of insulation test modules connected with the control module and arranged parallelly, M groups of cable selection modules arranged parallelly, and a mutual-exclusion cable selection matrix module arranged in the control module. Signal cables needing to be tested are tested simultaneously by the multiple groups of insulation test modules, the mutual-exclusion cable selection matrix module or a non-test matrix module is arranged, the signal cables which cannot be subjected to insulation test simultaneously are marked and selected so as to be not tested temporarily or not to be tested directly, and the signal cables which can be tested simultaneously are tested; and the multiple line of cables are tested simultaneously, the test efficiency is high,