The invention discloses an assembly line automatic detection system for a standard relay protection device. The system comprises an integrated detection control console, a scanning module, an assembly line platform, a standard interface module, a relay protection testing device and a direct current power module. The integrated detection control console controls the scanning module, the assembly line platform and the relay protection testing device through the Ethernet to work and obtains detection data. The scanning module scans a label to obtain the information of the detected device. A corresponding detection template is called, the assembly line platform is controlled to automatically transmit the detected device to a detection station, automatic positioning is achieved according to the size and an interface of the detected device, the detected device is in butt connection with a standard interface module, and the detected device is automatically connected into the detection system; a universal control interface controls the relay protection testing device to output detection quantity and obtain feedback detection data, meanwhile, an MMS client side is used for controlling the detected device and obtaining the station control layer information of the detected device, all items of the detected device are automatically detected, and a detection report is automatically formed.