Agricultural spraying unmanned aerial vehicle capable of automatically detecting residual pesticide amount

The agricultural spraying unmanned aerial vehicle comprises a box body, a sliding groove is machined in the rear portion of the inner wall of the box body, the inner wall of the sliding groove is connected with an installation structure, the installation structure comprises a support, a straight rod, a circular plate, a spring, a handle and a clamping plate, the rear portion of the outer wall of the support is slidably connected with the inner wall of the sliding groove in a clamped mode, and the straight rod is connected with the clamping plate. The outer side of the support is in clearance fit with the outer wall of a straight rod, and the outer side of the straight rod is connected with the inner side of a circular plate in a welded mode. According to the agricultural spraying unmanned aerial vehicle capable of automatically detecting the residual pesticide amount, a handle in the mounting structure drives a circular plate to move outwards, the circular plate drives a straight rod to move outwards, the str