A vehicle rack includes two cross beams, the cross beams being hollow square rods parallelly placed, the bottom center of the cross beam being provided with a sliding slot along the beams; two fixing rods, the fixing rods being hollow and each including an H-shaped reinforcing seat, the H-shaped reinforcing seat forming an upper sliding slot I on a top surface of the fixing rod and forming a lower sliding slot I on a bottom surface of the fixing rod, the fixing rods being particular to the two cross beams; a plurality of connecting seat, the connecting seats movably connecting the cross beams and the fixing rods, the connecting seats including upper bolt connecting parts; a plurality of supporting frames, the fixing rods each connecting two supporting frames, the supporting frames including lower bolt connecting parts.