The invention discloses a novel environment-friendly phosphogypsum high-strength lightweight wall material product. The product is prepared from raw materials in parts by weight as follows: 5-20 partsof composite powder, 30-80 parts of building phosphogypsum, 10-50 parts of ceramsites, 0.05-0.3 parts of a retarder, 0.3-1.5 parts of a water reducer, 0.1-1.0 parts of a waterproof agent, 1-5 parts of an exciting agent, 0.05-0.3 parts of an anti-creeping agent, 0.01-0.5 parts of a binder and 40-60 parts of water. The building phosphogypsum is taken as a main raw material for preparing a wallboard, a building block and a brick, a solution is provided for comprehensive utilization of solid waste industrial byproduct phosphogypsum of the phosphogypsum industry, and the product has great significance in environmental protection and sustainable development; and the prepared novel environment-friendly phosphogypsum high-strength lightweight wallboard/building block/brick has the advantages of lightweight, high compressive strength, high breaking strength, low water absorption and the like and can be widely applied to interior and exterior decoration materials.