Dual-track type Ultrasonic Internal Rail Flaw Detector is suitable for all kind of rail track, all-weather automatic qualified detection, based on industrial ultrasonic flaw detection and optical visual detection to realize the rapid non-destructive and integrity assessment and inspection of the rail during the "Skylights period". The product has the characteristics of automation and intelligence so as to reduce the current manual detection of labor intensity, slove the consistency deviation and other problems. It can effectively improve the efficiency of railway inspection and provide comprehensive analysis and evaluation methods. Discover traceable and assessable hidden danger of rail in time to ensure the safety of railway operation.