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Based on machine vision principle and Fuzzy PID control theory of parameter self tuning, a new automatic verification system of dew point meter is designed and developed, many problems of the traditional dew point meter have been solved, such as large amount of data, large error, difficulty in controlling dew point temperature, low efficiency and so on. The system uses fuzzy PID controller to realize dew point generator dew point temperature fixed point automatic control, and the automatic collection and processing of the data of standard dew point hygrometer and dew point hygrometer were realized by machine vision device; At the same time, the data processing and management system software of the host computer is developed, Human computer interaction and data management, automatic acquisition and processing, so automatic storage and verification, automatic generation of original records and certificates and other functions are realized in time. Test results verify that the system runs reliably and the calibration accuracy can meet the requirements of the procedure. The system uses modular design, with good flexibility, reliability and scalability, and it can be modified or extended according to the actual verification requirements, which greatly improves the accuracy and efficiency of the dew point meter calibration.