Based on the visual cognition characteristics of preschool children, explore the design evaluation methods of educational APP character drawing methods, and effectively evaluate each drawing method, provide a reference for designers to design roles, stimulate children's interest in learning, and improve learning efficiency and educational effects. Firstly, through literature analysis and expert interviews, the three dimensions of interest, significance and guidance are refined, combined with eye movement data indicators to construct an evaluation index system for preschool children's education APP role mapping; secondly, the entropy weight method is used to obtain each eye movement evaluation index; Secondly, the comprehensive scores and ranking results of the 6 drawing methods are obtained through weighted calculation; Finally, the optimal drawing methods of each dimension and the comprehensive three dimensions are screened out. The study found that children of different ages have different cognitive processing of character drawing methods; single-color flat coating has a greater impact on the interest and significance of children in the younger group, and the guiding effect of light and dark flat coating on children in the younger group is more obvious; Three-dimensional rendering has greater advantages in the three dimensions of children in the older group. At the same time, the two-dimensional rendering also has a more significant effect on the significance and guidance of older children. The application of entropy weight method in the design of educational app role drawing can effectively evaluate the interest, significance and guidance of the role, so that children can obtain a deeper level of interactive experience, and provide reference for the role design of preschool children education app.