The digital manufacturing method of engine cylinder head was introduced by combining casting technology with digital manufacturing technology. Different from traditional casting based on 2D drawings and casting experience, the whole process of digital manufacturing was based on 3D CAD digital model. At the same time, the computer simulation analysis technology was combined with the casting process technology to realize the whole process digital design, digital simulation analysis and digital processing and forming. The results show that through its integrated application, the six-cylinder engine head has been successfully developed, which provides a new manufacturing method for the rapid development of complex parts.