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In order to prevent lawless persons from planting illegal programs when USB devices are connected with computers, and stealing sensitive information in the computer or controlling the computer to issue illegal instructions to peripherals, this paper proposes a plan to create black and white lists for USB-key access security. Traditional USB-key security precautions are based on encryption authentication, without considering the security of USB devices connected to the tax control machine. Therefore, this paper proposes to classify the connected USB devices and implement corresponding processing schemes for different types of USB devices. Through the design and development of the hardware detection equipment and software control program for the tax control system, the security detection is carried out from the physical layer to the USB device connected to the tax control machine. The hardware design drawing and software control program flow chart of USB device filter are given, and several representative devices are tested. The test results show that the device can effectively detect the legitimacy of USB devices and deal with the illegal USB devices, which improves the security of USB-key access to USB devices in the tax control system.