Device and method for quickly evaluating artificial grazing intensity based on remote sensing of unmanned aerial vehicle

The invention belongs to the technical field of grazing intensity evaluation, and particularly relates to a device and method for quickly evaluating artificial grazing intensity based on unmanned aerial vehicle remote sensing, and the device comprises an unmanned aerial vehicle body, an observation module and a connecting piece thereof, the observation module comprises a trumpet-shaped cylinder formed by an upper combination part and a lower combination part, a mounting seat extending out of or retracting into the wide opening end of the trumpet-shaped cylinder in a sliding manner, an observation part arranged on the mounting seat, a linkage frame extending out of or retracting into the narrow opening end of the trumpet-shaped cylinder in a sliding manner, and a linear driving part for driving the observation part to move; the upper combination part and the lower combination part are subjected to integrated injection molding to obtain a trumpet-shaped barrel, the trumpet-shaped barrel is not only a mounting s