Variable-pitch structure of coaxial dual-rotor unmanned aerial vehicle

The utility model provides a variable-pitch structure of a coaxial double-rotor unmanned aerial vehicle, which comprises a main shaft, a variable-pitch propeller clamp, a first-layer variable-pitch mechanism and a second-layer variable-pitch mechanism, and the variable-pitch propeller clamp, the first-layer variable-pitch mechanism and the second-layer variable-pitch mechanism are sequentially arranged from top to bottom; the second-layer pitch changing mechanism is fixedly connected with the main shaft; the first-layer pitch changing mechanism is provided with a rotating inner ring and a fixed outer ring, the rotating inner ring is rotationally connected with the main shaft, and the fixed outer ring is rotationally connected with the rotating inner ring; the rotating inner ring is connected with the variable-pitch propeller clamp through a first connecting rod assembly, and the fixed outer ring is connected with the second-layer variable-pitch mechanism through a second connecting rod assembly. The variable-