Folding mechanism and foldable vehicle

The embodiment of the invention provides a folding mechanism which comprises a mounting seat, a support, a limiting shaft and a control piece, and a groove is formed in the mounting seat; the supportis connected with the installation base in a pivoted mode, and a kidney-shaped hole is formed in the support. The limiting shaft is located in the support and can slide along the kidney-shaped hole. And one end of the control piece is connected with the limiting shaft, and the control piece can enable the limiting shaft to slide along the waist-shaped hole, so that the limiting shaft is accommodated in the groove or is separated from the groove, and the bracket can be fixed or rotated relative to the mounting seat. According to the folding mechanism, the control piece is controlled to enable the limiting shaft to slide along the kidney-shaped hole, so that the limiting shaft is contained in the groove or disengaged from the groove, the support can be fixed or rotated relative to the mounting base, and the folding