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In order to solve the problems of lack of coordination and low debugging efficiency between the test tooling of each process during the single-car commissioning of standardized EMU, a single-car test device is designed. The device is based on vehicle communication network and can interact with digital commissioning platform and other intelligent equipment, so as to realize the systematization and intellectualization test of EMU single car. In this paper, the overall function of the device is introduced, and the hardware structure and software function realization are described in detail. The field test results show that the device can meet the requirements of single car commissioning of standardized EMU, effectively optimize commissioning process, reduce the number of commissioning workers, and greatly shorten the production cycle of EMU, reduce operating costs, and improve production efficiency and quality.