Expanded polystyrene board, the polystyrene foam plastic plate with the closed-cell structure is prepared by heating and molding the expandable polystyrene beads in a mold after heating and pre-release, ripening, molding, drying and cutting, etc. It can be made into foam products with different density and different shapes, and can also produce various foam boards with different thickness. Widely used in construction, heat preservation, packaging, freezing, daily necessities, industrial casting and other fields. It can also be used for displaying the manufacturing of the meeting place, the commodity cabinet, the advertisement signboard and the toy. In order to meet that requirement of the national construction section, the external heat insulation of the wall body can be mainly applied, and the heat preservation and floor heating in the outer wall can be achieved.