According to the structure characteristic of the existing equipment for working special-shaped stones, the function partition sketch map of equipment is established in the paper by means of function analysis on the basis of various module partition methods. The theory of function analysis is used to discuss the procedure and method of module partition. Qualitative analysis method based on function is put forward in the paper to divide the main parts with explicit function and structure, while quantitative analysis method is for those whose ascription is ambiguous. The module partition of equipment for working special-shaped stones is completed according to the principle of module partition, establishing the foundation for modularization design and manufacture of equipment.