A monitoring system based on STM32F205RC for shearer disc brake is designed in this paper, considering the potential danger because of the high temperature and friction for the friction plate of shearer disk brake. 32 bits ARM STM32F205RC is chosen as core CPU and had fast performance speed and high price quality. MAX6610 is chosen as reference circuit of ADC and temperature cold junction compensation circuit and to improve the temperature’s accuracy. The system can display the temperature and friction real time and give alarm according to the limit value, and ensure the safety performance of disk brake.