The utility model discloses a roofing light heat insulation water-repellent hollow block which belongs to the field of building materials. The utility model aims to provide a new product which integrates the light quality, the heat insulation and the waterproofing functions into one body with the advantages of simple and convenient construction and low cost, and the existing engineering arts of waterproofing function and thermal insulation of a roof are improved. The block forms a cuboid shape, a cube shape and a regular hexagonal cylinder shape, and holes of the block are all drilled from the bottom to the top without penetrating an upper surface layer. A base material of the utility model is formed by preparing and mixing cement, fly ash and expanded perlite or expanded vermiculite. White cement, sand, pigment and water repellent are mixed and milled to form the plus material. The utility model is molded by the pressure of mechanical vibration and is carried out with natural curing. Roof construction relating to the block is disclosed in the picture.