The work aims to explore basic data for high-precision design of molded pulp products. Considering the geometrical characteristics of pulp molding, the geometry of different cross sections of the actually produced molded pulp was tested by modern test instruments to get the geometrical data of cross section, and the geometrical dimensions of the geometrical features were obtained by data fitting method. According to the definition of shrinkage, the shrinkage of different geometric features was obtained. The mean rate of film shrinkage was 5.71%. The shrinkage rate of the convex cavity in the middle along the length direction was negative, and the larger the length was, the smaller the elongation was. The shrinkage of the concave cavity was a positive, and the larger the length was, the smaller the shrinkage was. The mean rate of change in cavity height was 4.7%. The radius of the chamfered arc changed greatly, and the average shrinkage rate was 70.61%. The work has overcome the shortcomings of previous researchers to study the shrinkage of molded pulp only by regular molded pulp samples (squares), thus providing basic data for the precise design of molded pulp.