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A detection system is developed for regular sensors of automatic weather stations. This paper introduces the sensor signal acquisition circuit and the way to determine faults of sensors based on the analysis of collected data. While detecting temperature, humidity or air pressure sensor, a laboratory calibrated sensor is introduced as the standard and is detected under the same environment simultaneously with the sensor being tested. After statistical analysis, four working modes of the sensors are categorized automatically. By analyzing the code relationship of the Grey codes exported by the wind direction sensor, nine particular testing locations that are different from the regulation of metrological verification are developed and therefore all the exported codes are detected. The detection of wind speed sensors and rain gauges simulates the laboratory verification regulation to achieve quasiexperimental effects. The system has been applied in the frontline of meteorological equipment support of Guangdong Province. It shows stable performance and meets the demands of supporting service.