The invention relates to composite material propeller blade sheet molding and transition connection technical study. The technical study includes the following steps that (1) propeller blade sheet molding is carried out, wherein a paddle die and a reinforcing material are selected and treated, a plurality of layers of carbon fiber cloth is led out from the interiors of paddles in the paddle paving design process, and die assembly, pressurizing, heating, curing and aftertreatment re carried out after paddle paving is finished; and (2) paddle and paddle hub transition connection is carried out, wherein a fixing tool is used for fixing the multiple paddles, the paddles are subject to paving design, the carbon fiber cloth led out from the interiors of the paddles is paved inside the paddles, and the carbon fiber cloth led out from the interiors of the paddles and the propeller hub are subject to co-curing. The processes of sheet molding propeller blades and transition connection are adopted, the continuity of fibers inside the paddles and the paddle hub is guaranteed, the continuity of fibers on the inner wall of the paddle hub is guaranteed, the strength of the connecting position of the propeller blade and the propeller hub is improved, the process is simple, and the reliability is high.