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The onboard data integration collection system is based on the collection of the train MVB control network and Ethernet information network, and has the core functions of collecting and fusing, pre-processing, data analysis, centralized recording and unified transmission of all state data of the train. It can also support the construction of train-level monitoring Ethernet networks and unified maintenance ports through product configuration solutions, which can support high-speed wireless landing of the equipment's own data, as well as data transmission based on new 5G and other ultra-high-speed vehicle-to-ground wireless communications. The onboard data integration and collection device can support remote tracking and monitoring of trains to ensure operational safety, automatic transmission of complete data to support train fault analysis, and full life-cycle train health management applications to support ground center systems.