This experiment developed a kind of mold which can be used to produce the special molded pulp packaging products without draft angle. The molded pulp wine-box base was taken as an example. By analyzing the structure and molding process of the product, the calculation method of mold working dimensions, demolding process and split structure of the mold were studied. Based on the requirement of molding process and mold design of pulp molded products, a split type suck-filtration mold was designed. When designing the split mold， the factors must be considered such as the average shrinkage and its fluctuation, mold manufacturing and assembly errors, etc. The upper mold should be split into two symmetrical parts along the diagonal and the lower mold needed a flange structure to locate the upper mold accurately.