Abstract: A ceiling fan blade installation structure includes a plurality of fastening units on a ceiling fan body. The fastening unit has an accommodating groove for accommodating a root of the blade. The fastening unit includes an elastic fastening piece. The blade has a corresponding retaining hole. When the root of the blade is inserted into the accommodating groove of the fastening unit, the elastic fastening piece is locked in the retaining hole of the blade, such that the blade is fixed to the ceiling fan body. The blades can be quickly assembled on the ceiling fan body, which shortens the installation time of the blades greatly and reduces the risk of the installer falling.