Folding mechanism and foldable vehicle

The embodiment of the invention provides a folding mechanism which comprises a support, a rotating piece, a mounting seat, a pivoting piece, a first limiting shaft, a second limiting shaft and a control piece, the rotating piece is connected with the support in a sleeving mode, and the rotating piece can slide relative to the support; mounting holes, sliding grooves, first limiting grooves and second limiting grooves are formed in the mounting base at intervals, wherein the first limiting grooves extend in the direction close to the mounting holes along one ends of the sliding grooves, and thesecond limiting grooves extend in the direction close to the mounting holes along the other ends of the sliding grooves. The pivoting piece is connected with the mounting hole and one of the bracketand the rotating piece, which is positioned outside, so that the bracket and the rotating piece can rotate around the pivoting piece relative to the mounting seat; the second limiting shaft can slidealong the sliding groove, t