With the development of 3D CAD technology, the repeated transmission of product manufacturing information between 3D models and 2D drawings has seriously affected the correct and rapid transmission of product manufacturing information. Based on the three-dimensional product manufacturing information technology, taking the explosion-proof cover of shearer as an example, the three-dimensional model of the explosion-proof cover plate is established in UG NX10.0 and the three-dimensional annotation is carried out. The machining process route is designed and the CNC machining tool path is planned. The machining simulation is carried out to verify the correctness of the CNC machining. On this basis, the three-dimensional design of the explosion-proof cover of the shearer is completed. The research is of great significance to the digital design and manufacturing research based on model definition and the realization of manufacturing informationization.