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Satellite Cable plays a key role in the transfer of energy and information in spacecraft system engineering, and it is not repairable after liftoff, which determines that it must be of high quality and high reliability in electric performance. In view of the disadvantages of the traditional manual mode of conduction test and insulation test, such as high work intensity, low detection efficiency and low reliability, this paper designs and develops an automatic detection instrument. The instrument is based on the idea of modular design with the central controller for each module control unit to respectively realize test channel automatic switching, the test voltage supply, the star cable conduction insulation resistance data acquisition, communication, storage and display. The practice has shown that the cable automatic insulation test instrument can not only improve the reliability of the conduction and insulation test, but also enhance the quality control. On the other hand, it can improve the efficiency, save the production cycle, and reduce the labor intensity.