A folding mechanism, comprising: a first movable member (201, 301), a second movable member (202, 302), a ground contacting component (203, 303), a folding shaft (204, 304) passing through the ground contacting component (203, 303) and a limiting mechanism, wherein: the first movable member is provided with a first connecting end, and is connected to the ground contacting component by the first connecting end; the second movable member is provided with a second connecting end, and is connected to the ground contacting component by the second connecting end; the first movable member and the second movable member are configured to rotate relative to one another around the folding shaft as a pivot shaft, to unfold or fold the folding mechanism; one end of the limiting mechanism is connected to the first connecting end and the other end is connected to the second connecting end, to limit rotating ranges of the first movable member and the second movable member rotating relative to one another around the folding shaft as the pivot shaft; characterized in that the limiting mechanism comprises: an arc-shaped sliding groove, one end of the arc-shaped sliding groove being connected to the second connecting end and the other end being suspended above the ground contacting component, an radian value of the arc-shaped sliding groove being a preset threshold; and a locking pin, one end of the locking pin being connected to the first connecting end and the other end extending into the arc-shaped sliding groove and being slidable along the arc-shaped sliding groove, to limit the rotating ranges of the first movable member and the second movable member rotating relative to one another around the folding shaft as the pivot shaft. the first movable member is provided with a first connecting end, and is connected to the ground contacting component by the first connecting end; the second movable member is provided with a second connecting end, and is connected to the ground contacting component by the second connecting end; the first movable member and the second movable member are configured to rotate relative to one another around the folding shaft as a pivot shaft, to unfold or fold the folding mechanism; one end of the limiting mechanism is connected to the first connecting end and the other end is connected to the second connecting end, to limit rotating ranges of the first movable member and the second movable member rotating relative to one another around the folding shaft as the pivot shaft; characterized in that the limiting mechanism comprises: an arc-shaped sliding groove, one end of the arc-shaped sliding groove being connected to the second connecting end and the other end being suspended above the ground contacting component, an radian value of the arc-shaped sliding groove being a preset threshold; and a locking pin, one end of the locking pin being connected to the first connecting end and the other end extending into the arc-shaped sliding groove and being slidable along the arc-shaped sliding groove, to limit the rotating ranges of the first movable member and the second movable member rotating relative to one another around the folding shaft as the pivot shaft. an arc-shaped sliding groove, one end of the arc-shaped sliding groove being connected to the second connecting end and the other end being suspended above the ground contacting component, an radian value of the arc-shaped sliding groove being a preset threshold; and a locking pin, one end of the locking pin being connected to the first connecting end and the other end extending into the arc-shaped sliding groove and being slidable along the arc-shaped sliding groove, to limit the rotating ranges of the first movable member and the second movable member rotating relative to one another around the folding shaft as the pivot shaft.