A folding lock comprises a folding plate assembly, a lock seat, a fixing sleeve, a lock core seat, a lock core, a connecting swivel, a lock column, and a fixing collar. A fixed folding plate of the assembly is provided with a connecting seat, the lock seat is disposed on the connecting seat and provided with an insertion hole, an inlay protrudes from the insertion hole, the fixing sleeve inserts into the connecting seat and disposes in the lock seat, the lock core disposes in the lock core seat, the connecting swivel is assembled on the lock core seat, a torsion spring disposes between the lock core seat and the connecting swivel, the lock column is assembled on the connecting swivel, a compression spring is sleeved on the connecting swivel and the lock column, and the fixing collar is disposed in the fixing sleeve.