The invention belongs to the field of unmanned aerial vehicles, particularly relates to an unmanned aerial vehicle quick disassembly mechanism, an unmanned aerial vehicle and a quick disassembly method, and aims to solve the problems that an existing unmanned aerial vehicle is fixed in structure, tedious in disassembly and assembly steps, time-consuming and labor-consuming, and low in use efficiency. The following scheme is provided: the unmanned aerial vehicle quick disassembly mechanism comprises a machine body; the bottom of the machine body is fixedly equipped with a mounting plate; two supporting legs are fixedly mounted at the bottom of the mounting plate, two moving grooves are formed in the bottom of the mounting plate, quick disassembly plates are slidably mounted in the two moving grooves, a loading box is mounted at the bottom of the mounting plate, and the sides, close to each other, of the two quick disassembly plates make contact with the loading box; and first toothed bars are fixedly mounted on the sides, close to each other, of the two quick disassembly plates. The unmanned aerial vehicle quick disassembly mechanism is reasonable in structure and convenient to operate; the unmanned aerial vehicle is flexible in structure, easy and convenient to disassemble and assemble, and time-saving and labor-saving; rapid disassembly and assembly can be achieved, and the disassembly efficiency and the use efficiency are greatly improved.