The invention discloses a light inflaming retarding core material for an aluminum-plastic composite board, and when the light inflaming retarding core material is applied in the aluminum-plastic composite board, a high-performance aluminum-plastic composite board is obtained. The core material is made of raw materials containing a component A and a component B. Based on 100 parts of the total weight of the component A and the component B, the component A comprises 42-90 parts of polypropylene resin, 1-6 parts of polyfunctional monomers, 5-10 parts of phosphorus reaction type monomers, 0.5-3 parts of nanometer powder catalyst, 0.01-0.1 part of accelerator and 0.05-0.5 part of initiator; and the component B comprises 0-48 parts of polypropylene resin, 1-5 parts of carbon-forming agent, 1-5 parts of nucleating agent master batch, 0.5-2 parts of foaming agent, 0.2-2 parts of antioxidant and 0.1-0.2 part of wetting dispersant.