Ducted unmanned aerial vehicle propeller pitch changing mechanism

The utility model relates to a propeller pitch changing mechanism of a ducted unmanned aerial vehicle, and belongs to the technical field of unmanned aerial vehicles. Comprising a propeller hub, a propeller clamp assembly body, a transmission shaft system, a variable pitch system and a power system. The propeller hub and the propeller clamp assembly are arranged on a transmission shaft in the transmission shaft system in an interference fit mode and connected with the variable pitch system through a connecting piece. The power system adopts a motor as a power source and provides power for rotation and variable pitch movement of the propeller. According to the lever principle, the motor drives the control rod to rotate around the lever support, the control rod drives the variable-pitch system to move up and down, so that the propeller clamp rotates around the variable-pitch shaft, the total pitch is changed, the variable-pitch function is achieved through a simple mechanical structure, lift force generated by