The invention relates to a method for parameterized assembly design of three-dimensional mold structure and automatic dimensioning of two-dimensional drawings. ; Determine the distance between the finished product, the mold core and the template; Step 2: Design the mold sub-structure, respectively execute the instructions of the slider structure, inclined pin structure, cooling circuit, small entry structure, and ejection structure of the main components of the mold, through the computer Calculate, generate slider, inclined pin, cooling circuit, small entry sub, thimble components; Step 3: Execute the command of the assembly drawing to generate a two-dimensional assembly drawing; Step 4: Change the design requirements, and repeat the instructions of Step 2 and Step 3; Step 5: Output the official 2D final assembly drawing; Step 6: Output the 2D part processing drawing with automatic dimensioning. The present invention makes the mold structure design more convenient and the flow more reasonable, improves the mold design quality, shortens the total mold design man-hour, and reduces human errors.