The invention discloses a folding wing mechanism. The folding wing mechanism comprises folding wings and a folding mechanism which is used for providing power for the deploying of the folding wing andlimiting the deploying absolute limit; the folding mechanism comprises a limiting buffer column; and when the folding wings deploy to the absolute limit, the folding wings are blocked by the limit buffer column. According to the folding wing mechanism, the upper wing and the lower wing are driven by a central arm torsion spring to simultaneously deploy, torsion arms are respectively assembled with torsion spring mounting holes on the upper wing root and the lower wing root, the installation is simple and reliable, and the environmental dependency is small; a lock pin assembly is used as a locking mechanism after the wing surface opens, the structure is simple, the size is small, the reliability is high, the replacement is easy, the unlocking is simple, the wings can be quickly folded after the unmanned aerial vehicle is recycled, and recovery of the unmanned aerial vehicle is completed; the mature product needle roller end bearings are used to reduce friction, the frictional resistance of the opening process is reduced, and the rapidity and the synchronism of the opening process are ensured; and the whole folding mechanism is high in integration degree, simple in mechanism, smallin size, simple in assembly and simple and convenient to operate, and meets the requirements of the cylindrical launching unmanned aerial vehicle for folding wings.