The present invention discloses a conduction and insulation automatic test method of an aerospace low frequency cable network, comprising the specific steps: the step 1, introducing a contact connection relation of the low frequency cable network consisting of cable numbers and electric coupler numbers to an upper computer; step 2, sending conduction and insulation test parameter information, the electric coupler numbers and the cable numbers information to a relay control module through a single chip microcomputer, controlling switch of the relay, selecting a corresponding pathway of the conduction and insulation test circuit to test, and obtaining conduction and insulation values; the step 3, transmitting the conduction and insulation values obtained in the test in the step 2 to a data acquisition module through the single chip microcomputer, and transmitting resistance values of the conduction and the insulation to the upper computer; and the step 4, checking the resistance values of the conduction and the insulation obtained in the step 3 and the conduction and insulation test parameters, and verifying the correctness of the conduction and insulation test values. According to the invention, the conversion from the qualitative test to the quantitative test is realized, and automatic recording and comparison of data are achieved, thereby improving the testing efficiency and the accuracy of the test.