The invention relates to a cable insulation test system which comprises five parts, including an insulated resistance meter, a cable wiring disc, a test operation box, a grounding lead and cable clamps, wherein the cable wiring disc is made of an insulated material, the whole cable wiring disc has a rectangular middle part and two semicircular side parts, three metal wiring columns are vertically fixed in the middle of the cable wiring disc, and one metal wiring column is vertically fixed on the lower right side of the metal wiring column; the test operation box is a sealed box body, the casing of the sealed box body is made of hard plastic and other insulated materials, the upper part of the test operation box is provided with two metal wiring columns, the lower part of the test operation box is provided with four metal wiring columns, a switch is arranged on the right side of the test operation box, and a six-segment mechanical change-over switch and a self-locking button are arranged on the panel of the test operation box; and the grounding lead is a multi-strand soft copper wire with insulated outer leather. During the measurement, the system does not need to change wiring, shortens the test time by about 80 percent, meanwhile remarkably lowers the probability of a wiring error, remarkably improves working efficiency, and ensures the safety of test process.