The present invention relates to a ceiling fan blade assembly, including: a mounting bracket has a positioning portion and a mounting portion, and an arm being disposed between the positioning portion and the mounting portion for connecting them together, the positioning portion is fixed to a ceiling fan's base body; plural fixing elements are secured on the mounting portion of the mounting bracket, one of the plural fixing elements located close to a position where the mounting portion and the arm are connected; an elastic plate has protrusive latch hooks which located in symmetric manner, the elastic plate is fixed by the fixing elements and located close to the position where the arm and the mounting portion are connected, and two wing portions of each elastic plate are located at both sides of the arm of the mounting bracket; a ceiling fan blade is provided at an end thereof with plural holes, the holes each have a gap, and the gap of the respective holes being directed in the same direction.