Through in-depth analysis of aluminum alloy investment casting technology, it is found that in the application process of aluminum alloy investment casting, the performance of the model material selected for precision casting and the quality of the wax mold will affect the final aluminum alloy surface. the roughness of the formation. The reason is that the material properties of aluminum alloy materials are reflected in its low density and low melting point. In relatively dry air, the metal material will automatically form an oxide film with protective properties, which cannot pass through the wax mold and casting wall. The tiny holes on it are replicated. Therefore, after the aluminum alloy investment casting, its surface is relatively uneven. In order to meet the needs of modern heavy industry for large-scale castings with thin walls and complex structures, the current technology research and development department has been committed to researching film materials with high strength and good performance that are not easy to shrink and deform, such as water-soluble core forming, liquid mold material high pressure Injection molding and other technologies have been rapidly developed, applied and developed. In terms of technical application, the continuous improvement of the production and development of wax pressing equipment, the emergence of large wax pressing machines provides conditions for the manufacture of large investment parts, such as the V-3002 wax pressing machine produced by TEMPCRAFT in the United States, the maximum forming force can be up to 3000kN. This technology has been widely used in the production of mechanical equipment parts, such as the production of investment casting technology medium-pressure wax machine investment parts.