The invention relates to a method for using foam polyphenylacetylene to produce polyphenylacetylene extruded plastic foam plate, which comprises: (1), classifying the foam polyphenylacetylene material via colors; (2) breaking said material, and making particle in the particle maker, while the temperature is 160-200Deg. C; (3), collecting the particles, adding agent, mixing, while the ratio between the particles and the agent is 100:0-10; (4) mixing and fusing said particles in plastic extruder, adding carbon dioxide foaming agent, to foam, while the mass ratio between the particle and the foaming agent is 100:4-15, to be extruded from mould, to obtain the foam plastic plate. |