The invention discloses a propeller reversing over-running protecting structure of propellers. The propeller reversing over-running protecting structure comprises a gas circuit control device and an oil circuit control device, wherein the gas circuit control device is arranged between a gas compressor of a turboprop engine and a speed regulator of the propellers in a communicating way; the rotating speeds of the propellers are adjusted by air pressure through the gas compressor; the oil circuit control device adjusts the fuel oil return volume of the turboprop engine and is associated with the gas circuit control device; when the rotating speeds of the propellers reach a set value, the gas circuit control device is conducted with the speed regulator of the propellers; the oil circuit control device controls a fuel oil circuit of the turboprop engine to conduct. According to the propeller reversing over-running protecting structure disclosed by the invention, the air pressure of the gas compressor and the rotating speed of the propellers are associated; the fuel oil of the turboprop engine is controlled to return; in addition, the gas circuit control device and the oil circuit control device are arranged in an associating way; when the rotating speeds of the propellers are over high, the oil circuit control device is driven by the gas circuit control device to act; the turboprop engine is opened, the fuel oil return volume of the turboprop engine is adjusted, and a driving force is reduced, so that the rotating speeds of the propellers are reduced.