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Standardised and miniaturised outdoor installation protection is the development trend of relay protection in AC transmission power grid, which has the advantages of saving investment, promoting reliability, and reducing on-site workload. To realise fully functional and efficient automatic closed-loop detection of outdoor protection is of great significance. In this study, key technology of assembly line automatic detection and its platform construction method including hardware and software is firstly proposed. Furthermore, overall design idea, system structure, and core detection procedure of assembly test platform are discussed and then some key technology such as QR code intelligent scanning, automatic transmission and loading, design of general detection template, and information mapping correlation method are introduced in detail. Besides, this automatic detection system initially realises the function to simulate the actual operation data under prototype environment. The application of this new technology can meet the needs of popularisation and application of outdoor installation protection and establish foundation for the mode of ‘factory assembly test and on-site replacement maintenance’ for relay protection in future.