Flange is quite widely used in industrial manufacturing fittings, flange products need to be tested after production molding, and the detection of the flange is used more current ways of artificial detection. In order to reduce labor costs, improve the testing efficiency and accuracy, a flange precision testing machine is designed. The OLE(Object Link Embed) for Process Control (OPC) interface control technology and KINGVIEW design interface were used to control the operation of the various agencies.The flange precision testing machine which can realize the flange size measurement, automatic control, automatic startstop, automatic detection data, and other functions, is of high precision and automation level, and has broad application prospects.