The invention belongs to the technical field of material additive manufacturing, and discloses a material additive manufacturing method. The material additive manufacturing method includes the steps that a reference block is installed on a base plate; material additive manufacturing of a part is carried out on the top surface of the reference block; the reference block with the part is removed from the base plate; the part is machined using the reference block as a reference; and the reference block is separated from the part. In the material additive manufacturing method, by arranging the reference block, the forming reference of the part can be retained after the material additive manufacturing is completed, so that the dimensional and position accuracy of the part is ensured in the subsequent machining. The utilization ratio of material additive powder, the manufacturing efficiency of the material additive part and the dimensional accuracy of the part can be further improved. The precision manufacturing of a non-machined surface of the material additive manufacturing part can be realized, so that the mixing of the machining surface and the material additive forming surface of the part is realized.