The invention discloses a propeller quick-release structure, a propeller assembly applying the propeller quick-release structure, and an unmanned aerial vehicle applying the propeller assembly, wherein the propeller quick-release structure includes a fixing seat, a pressing rod and a clamping and holding rod. A holding and placing cavity is formed in the fixing seat, and the fixing seat is fixed to an output shaft of a motor. The pressing rod is movably installed on the fixing seat, one end of the pressing rod is placed in the holding and placing cavity, and the other end of the pressing rod is exposed outside the fixing seat. One end of the clamping and holding rod is placed in the holding and placing cavity and abuts against the pressing rod, and the other end of the clamping and holdingrod stretches out or retracts back to the fixing seat. When one end, exposed outside of the fixing seat, of the pressing rod moves falling away the fixing seat, the clamping and holding rod stretchesout the fixing seat and is clamped and held with the a propeller. When one end, exposed outside of the fixing seat, of the pressing rod moves towards the fixing seat, and the clamping and holding rodretracts back to the fixing seat and breaks away from the propeller. The propeller quick-release structure, the propeller assembly and the unmanned aerial vehicle can enable the disassembly and assembly process of the propeller to be simpler, more efficient and more convenient.