Insect-imitating passive rotary flapping wing mechanism and insect-imitating ornithopter

The invention provides an insect-imitating passive rotary flapping wing mechanism and an insect-imitating ornithopter, and the flapping wing mechanism comprises an insect-imitating flapping wing, a driving rod located at a wing root position, a rotating shaft sleeve mounted on the driving rod, a belt wheel, a supporting shaft mounted in the rotating shaft sleeve, and a rotating bracket mounted on the driving rod and the supporting shaft, and the elastic belt is arranged on the belt wheel and the rotating bracket. The flapping wing mechanism can effectively absorb part of aerodynamic force and inertia force by utilizing an elastic potential energy storage mechanism of the elastic belt; and the elastic potential energy is released and converted into kinetic energy near the flapping reversal time position, so that the rapid rotating motion is completed, the power loss is greatly reduced, and the flapping efficiency is improved. According to the flapping wing mechanism, passive rotating motion is achieved through