The invention provides a manufacturing method for a
polystyrene A-level non-ignitable building outer wall heat-preservation decorative plate. The manufacturing method includes the steps that (1) banburying is carried out on 100
mass parts of XPS for 20-30 minutes, nucleating agents,
smoke suppression agents,
charring agents, stabilizer, solvents and fire retardants are added and mixed, then banburying continues, and particles are obtained to be used; (2) 95-99
mass parts of particles are put into a foam extruder to manufacture plates; (3)
sodium silicate is added into the other particles, banburying is carried out for 25 minutes, then the particles are put into a
film applicator, the plates obtained in the second step are put into the
film applicator, 15 kilos of pressure heat
coating films are added, and film-coated plates are obtained. Organic XPS materials are manufactured through the method, are not ignitable when being fired, non-toxic, odourless, safe,
environmentally friendly and high in
weather resistance, have heat insulation and heat preservation performance, are as bright and smooth as
ceramic tiles, and are free of decoration integration. The manufactured outer wall heat-preservation decorative plate extends the application field of outer wall heat-preservation decorative materials.