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A QEMU-based virtual test platform for OBDH software was proposed to deal with the problems of traditional test environment, including hardware dependence, too many types of equipment, monitoring point dispersion and lack of software internal watching. The virtual cpu based on dynamic binary translation was emulated to run onboard software in heterogeneous platform, and the machine codes were recorded to help software debug; combined with the chip driver and application, the device was simulated to offer the information flow transmission, and the system log was record in order to achieve a single window monitoring by hierarchical processing and real-time difference comparing in unified format. The virtual environment was used in GF-4 project, the result showed that it can emulate the running environment of onboard software, provide more debugging means and simulate the system data stream, software test can be carried out before the hardware is put into production, so that the software and hardware can be coordinated developed, and the efficiency can be improved.