A universal automatic test system for a digital plugboard based on imagine processing, includes a digital plugboard test platform, an image acquisition and processing module, a test instrument module and a control and processing module. The universal automatic test system can determine a type of the digital plugboard and a point to be test based on the image of the digital plugboard, and call a corresponding automatic test program to complete the test of each point. A type of the output signal can be obtained through the universal automatic test system. By moving the detection probe, the any position of the digital plugboard can be test, and a fault portion of the digital plugboard can be obtained according to the test result.