Additive manufacturing substrate, preparation method and additive manufacturing platform

The invention provides an additive manufacturing substrate, a preparation method and an additive manufacturing platform, relates to the technical field of additive manufacturing, and aims to solve the technical problem of high manufacturing cost of an additive manufacturing substrate material. The additive manufacturing substrate preparation method comprises the steps that a second contour structure at the bottom of a structural part is obtained; according to the second contour structure, a first contour structure of the substrate is determined, and the first contour structure is matched with the second contour structure; based on the principle of minimum feeding, the base plate is divided into N sub-sections, each sub-section is provided with at least one groove and at least one protrusion, the protrusion of one sub-section is matched with the groove of the other adjacent sub-section, and the protrusion is in clearance fit with the corresponding groove; or the bulges are matched with the corresponding groove