Based on the review of current status and development of casting CNC manufacturing technology, this paper analyzes the characteristics and studies the mechanism of casting CNC cutting, along with the processing technique. A new casting CNC forming equipment is developed and successfully applied to the product development in automobile industry, mechanical industry and so on, which is regarded as a typical application case. Research indicates that patternless casting CNC manufacturing is a technical renovation compared to the traditional casting manufacturing, with traits of green, digital, flexibility, precision, rapidity. It’s applicable to the rapid manufacturing of metal casting either in single piece or small lot, and the pattern is unneeded. This new technology brings a promising application future in the automobile and mechanical equipment industries.