Abstract: Automatic reading method of pointer meter of industry and mine based on image technology has been a research hotspot of industry and mine automation recently,but the urgent problem is the place of camera and imaging distortion affected the reading precision.The paper put forward a new automatic reading method of industry and mine meter based on difference image processing and angle-proportionment calculation,introduced design and implementation of sub-algorithm of degree scale calibration and real-time computer.The testing data showed that the method improves the automatic reading precision and the system’s robustness in industry and mine environment.