Suspended monorail traffic track beam external intelligent inspection and maintenance vehicle to realize the automation, informatization and intelligence of track beam external faults and defect inspections, and provide inspection and maintenance operating conditions. It has a car body, a drive unit, an intelligent detection unit, a driving control unit and a safety protection unit. The drive unit is composed of a power storage battery and a suspension bogie. The rear of the car body is equipped with a suspended monorail track beam inspection and maintenance operation platform, which is equipped with a sensor lifting bracket, a contour detector, a lifting fence translation track, an inspection and maintenance operation lifting platform, a limit detection laser sensor, and a corrosion detection camera; the suspended monorail The track beam inspection and maintenance work platform can move laterally and vertically on the translation track of the lifting fence, and the range of motion covers the left, right and lower sides of the track beam, providing an inspection and maintenance platform that can be moved horizontally and vertically outside the track beam. The contour detector and the corrosion detection camera of the intelligent detection system are installed on the vertically movable sensor lifting brackets on both sides of the middle of the car body, the corrosion detection camera is installed outside the middle of the bracket, and the contour detector is installed on the inside of the middle and top of the bracket .