Locking device, propeller, and aerial vehicle are provided. An exemplary propeller includes a blade; and a locking part, configured for locking the blade to a driving shaft. The locking part includes a fastening portion and a pressing portion. The pressing portion includes a pressing end, an abutting end including an accommodating hole, and an abutting part configured within the accommodating hole for abutting against the fastening portion. The fastening portion is accommodable within the accommodating hole of the pressing portion. The pressing portion of the locking part is slidably connected with the blade. A portion of the driving shaft protrudes into the accommodating hole of the pressing portion. The fastening portion is abutted against the abutting part of the pressing portion and engaged with the driving shaft to lock the driving shaft on the blade.