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For the testing and fault diagnosis requirements of high-speed maglev train brake controller during the development, experiment and production, the mobile comprehensive test bench is designed and developed by PXI bus and automatic test assembly (TPS) technology. By simulating various faults and abnormal working conditions, the fault handling, factory inspection, repair and maintenance capabilities of the controller are verified. The test show that the test bench has the advantages of miniaturization, modularity and high precision of mobile portability, and can realize the single-machine test of the brake system.