The invention belongs to the airplane design technology and relates to the improvement on an airplane trailing edge flap retracting mechanism. The airplane trailing edge flap retracting mechanism comprises a wing rear spar and a flap leading edge stringer and is characterized in that an outer rocker compound [1], an extension restraining rocker component [2] and an inner rocker component [3] are connected with the wing rear spar and the flap leading edge stringer to form the airplane trailing edge flap retracting mechanism. The airplane trailing edge flap retracting mechanism of the inventionhas a small fairing, a simple structure, light weight and a high space utilization rate and can meet the requirements on the aerodynamic efficiency of the flap. In the invention, the wing extension space occupied by the retracting mechanism at a retraction position is converted into the chordwise displacement produced by the flap when the retracting mechanism is at an extension position, so the problem of airplane performance reduction caused by an overlarge fairing of the flap retracting mechanism is solved effectively.