A non-contact special vehicle support roller height detector mainly comprises a special vehicle body, a clamping bolt A, an H-shaped crossbeam, an electric control cabinet, a speed reducer A, a servomotor A, a rotating shaft, a rolling bearing A, a rolling bearing B, a ball nut, a clamping bolt B, a slide table, a laser profiler, a U-shaped rotating arm, a ball screw, a rolling bearing C, a bearing pedestal, a rolling bearing D, a speed reducer B, a servo motor B, a rolling guide rail slide seat A, a rolling guide rail A, rolling guide rail B, a rolling guide rail slide seat B, a clamping bolt C, and a clamping bolt D. In the invention, the labor intensity of a worker during a roller assembling process can be greatly reduced, and roller assembling precision and production efficiency are increased.