The invention discloses a blade rear edge bonding angle male die preparing method. The method comprises the steps that three layers of presoaked resin glass fiber cloth are arranged on the SS face shell rear edge bonding area; three layers of presoaked resin glass fiber cloth are arranged on the PS face shell rear edge bonding area, and the glass fiber cloth is away from a PS face shell boss by acertain distance; after the presoaked resin galas fiber cloth is cured, a bonding agent is arranged on the PS face shell glass fiber cloth in a blade coating manner, an SS face shell and a PS face shell are subjected to die assembly, then, the glass fiber cloth on the SS face shell and the glass fiber cloth on the PS face shell are bonded into a whole, and then a rear edge bonding angle male die is obtained. The invention further discloses a method for preparing the rear edge bonding angle through the bonding angle male die. Through the arrangement of the glass fiber cloth with the misalignedend portions, a cavity structure of an omega-shaped structure is ingeniously avoided, the bonding angle male die adapts to blade rear cavities different in specification, and taking out is convenient.The prepared rear edge bonding angle is accurate in positioning, the bonding quality is good, and the phenomenon of rich resin is avoided.