Aiming at the crystal frame structure, the parametric modeling method of 3D printing blade skin was studied. The blade skin is divided into several small blocks, and each small block is composed of a crystal frame structure. The shape and strength of the skin can be controlled by adjusting the parameters of the crystal frame structure, and the thickness, hole size and distribution of the skin can be controlled. A blade skin is designed, and 3D printing and experimental verification are carried out. The experimental results show that this method can realize the manufacture of blade skin with high precision, and has good strength and stability.