Folding connecting structure with two-way positioning handle and foldable bicycle

The foldable connecting structure comprises a connector rotating shaft and shaft lugs on the two sides of the connector rotating shaft, and is characterized in that a sliding groove is formed in the handle, and the depth direction of the sliding groove is parallel to the axial direction of the connector rotating shaft; a sliding block and an elastic piece are sequentially arranged in the sliding groove in a sliding mode in the depth direction, and when the handle rotates to a first preset position, the elastic piece drives the sliding block to stretch out of the sliding groove to be matched with the first positioning structure; when the handle rotates to a second preset position, the elastic piece drives the sliding block to extend out of the sliding groove to be matched with the second positioning structure; the handle is positioned at the unlocking position and the locking position through the two-way positioning structure, the situation that the handle is accidentally unlocked or locked due to swinging is