Abstract: For problems that there are no efficient monitoring platform and reliable communication way about on-line monitoring system of mine-used high voltage cable, the paper proposed a design scheme of CAN bus controller of on-line monitoring system of mine-used high-voltage cable, and introduced design of hardware circuit, setting of Baud rate and realization of programming state-machine and SPI communication of the CAN bus controller in details. In the CAN bus controller, FPGA chip EP2C20F484C8 is monitoring core, MCP2510 is bus controller, and Verilog HDL is programming language. The experimental result verified performances of real-time and reliability of the CAN bus controller.