A method for automatically generation of sheet metal three-dimensional (3D) laser cutting path based on the incision filled model is proposed considering the sheet metal forming process. Automatic selection of incision features is realized through automatic recognition of incision features by using the concave edges between the incision faces, and the laser beam radius compensation is done through the offset of the edge loop of incision by using vertex offset method. On the basis of the incision features filling and the remodeling of the model, the laser head posture is determined using two normal vectors of the two triangles that shares the edge on which the laser beam points are located, which ensures the laser head perpendicular to the surface of workpiece in the whole process of laser cutting. The case studies show that the above algorithm is feasible and the system is stable and reliable.