Abstract: An intelligent terminal of mine inspection instrument is designed. STM32 single-chip microcomputer with rich resources and suitable for large capacity data processing and control as the core of control unit, the software and hardware development of intelligent terminal is carried out by adopting modular design concept. According to the special environment, the hardware circuit of power over-current protection and interface anti-interference are described in detail, and the software design is completed according to the inspection requirements. The intelligent terminal has high integration, stronger real-time and more efficient data processing, which is especially suitable for offline inspection in underground mine.