The wheel probe ultrasonic detection technology is adopted，9 channels of ultrasonic wheel probe and 18 channels of two rails are displayed on the military grade high-intensity LCD in the form of B-scan. The NDT wheel probe ensures the good coupling of the track with high wear on the curve section and rail surface, and can effectively detect the physical flaw at the rail head, rail waist screw hole crack and rail bottom transverse crack, total detection rate can reach about 95%, and it is equipped with an alarm to automatically enlarge the pop-up window, which is convenient for the operator to detect the rail flaw in real time. Titanium alloy vehicle body, patented split structure design, lithium battery drive, environmental protection and energy saving, with a detection speed of 15 kilometers per hour.