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To improve the stability and accuracy of gas sensor field calibration，Reduce the impact of changing environmental conditions on the accuracy and stability of measurements, simplify calibration procedures and reduce management costs，A network-based remote calibration device was designed that provides a reliable standard value for the measurement of gas measuring instruments. First, the calibration device acquires the temperature and humidity at the sensor site, transmits the sensor's measured gas concentration and temperature and humidity to the central control server over the TCP / IP network, and calculates sensor temperature and humidity corrections using a specific calibration algorithm. Then, use the corrected measurement value to measure the sensor. The experimental results show that the gas sensor calibrated by the designed calibration system is more stable and accurate than the traditional calibrated calibrated sensor, The error increased from 5.3% LEL to 0.3% LEL standard deviation from the 1.1% LEL after the traditional calibration method to improve to 0.6% LEL.