The invention relates to a foam heat insulation plate. The foam heat insulation plate comprises the following components in parts by weight: 100 parts of waste PS (polystyrene) foam particles, 30-50 parts of No. 425 Portland cement, 50-100 parts of early strength superplasticizer, 200-300 parts of expanded perlite powder, 50-100 parts of glass fiber, 50-80 parts of PU (polyurethane) adhesive, 1-10 parts of resin soap foaming agent, 2-5 parts of flame retardant and 1-5 parts of fly ash. The product has excellent heat insulation performance, and the heat conductivity can achieve 0.05W/(m.K); the relative density is 0.3, the compression strength is 0.4-0.6MPa, and the bending modulus is 0.25MPa; and the foam heat insulation plate is non-toxic, odorless, less prone to combustion, acid and alkali-resistant, good in insulativity, convenient to construct and long in service life, can be widely used and can continuously replace existing materials.