Bottom plate for flat bottom type liquefied natural gas storage tank

The utility model discloses a bottom plate for a flat bottom type liquefied natural gas storage tank. The bottom plate comprises an annular plate which is formed by a plurality of edge plates in connection, and a plate-shaped structure which is connected in the middle of the annular plate and formed by a plurality of center plates in connection, wherein the bottoms of the edge plates are connected with a base plate; the overall edge plate is in a sector shape; the outer side of each edge plate is in an arc shape; the other three edges of each edge plate are straight edges; the edge of each center plate, connected with corresponding edge plate, is a right-angle edge or an inclined edge. The bottom plate is simple in structure, and convenient to construct, and has the good humidity resistance and protection capability, not only can the construction difficulty of a steel plate for baiting be effectively reduced, but also the scrap quantity generated in the baiting process and the usage amount of a welding materi