The invention provides a comb tooth type vehicle carrier transverse-moving device high in moving speed and reasonable in design. The comb tooth type vehicle carrier transverse-moving device comprises transverse-moving drive devices and guide groove bracket mechanisms, wherein the transverse-moving drive devices are arranged on all layers and columns of cross beams on the front side and the rear side of a main stereo garage frame, each transverse-moving drive device includes a transverse-moving drive mechanism, a driving chain wheel mechanism, two driven chain wheel mechanisms and multiple small supporting wheel mechanisms, the transverse-moving drive devices drive the driving chain wheel mechanisms to rotate, the driving chain wheel mechanisms drive the driven chain wheel mechanisms to rotate, and the small supporting wheel mechanisms are arranged between the driving chain wheel mechanisms and the driven chain wheel mechanisms and on the outer sides of the driven chain wheel mechanisms. The guide groove bracket mechanisms are located at the front end and the rear end of a comb tooth type vehicle carrier body and installed on the driving chain wheel mechanisms and move with rotation of the driving chain wheel mechanisms.