The invention provides a plane embedded annular structure and a manufacturing process thereof. The plane embedded type annular structure comprises a plurality of arc section units, wherein the arc section units are sequentially connected end to end to form the annular structure, each arc section unit comprises an arc section main body, one end of each arc section main body is provided with a special-shaped splicing opening part, the other end of each arc section main body is provided with a special-shaped splicing block part matched with the corresponding special-shaped splicing opening part, the special-shaped splicing opening parts and the special-shaped splicing block parts of the adjacent arc section units are spliced, and a plurality of welding points are arranged at the splicing positions of the special-shaped splicing opening parts and the special-shaped splicing block parts, so that the special-shaped splicing opening parts and the special-shaped splicing block parts can be welded at the welding points. The invention discloses a manufacturing process of a plane embedded type annular structure. The manufacturing process comprises the steps of raw material detection, plate flattening, nesting programming, cutting, product inspection, splicing assembly, laser welding and product flattening. According to the invention, the utilization rate of raw materials is increased, the precision and planeness required by the annular structure in the spiral dehydrator are guaranteed, and the stability is high.