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In order to solve the problem of long time and difficulty to set up test environment of reliability simulation test of current manufacturing system software, the method of combining digital-twin technology and simulation acceleration test is proposed. To establish the high-fidelity digital twin model of the intelligent workshop instead of the real workshop system for reliability simulation test of the manufacturing system software, the system-level simulation model including products, equipment resources and process flow should be constructed. At the same time, in order to simulate the workshop production events process, the communication protocol and communication data between devices, as well as the sequence of production line events and queues should be set according to the actual production situation to simulate the operating environment of the system. By constructing digital twin model of stepping motor production line, simulating machining assembly process, running intelligent workshop system software, and using simulation clock propulsion mechanism to accelerate testing, the effectiveness and practicability of this method are verified, which can be used for reference in the high-fidelity testing of industrial system software.