The invention provides a material passage structure with multiple sprue gates in a cavity. Through the adoption of the structure, the pouring time needed by a flat product with large area during the pouring molding process is short, the porosity and the like of various parts of a product are enabled to be basically the same, and the appearance of the product is ensured. The structure comprises a front mould, a rear mould, a sprue plate, a sprue sleeve, a plate A and a plate B, wherein a cavity is formed between the front mould and the rear mould; the flat product with large area is arranged in the cavity; the spure sleeve is positioned inside the spure plate; the structure is characterized in that a material gathering cavity is formed below the center of the bottom of the spure sleeve, and is positioned between the spure plate and the plate A; eight radial horizontal material passages are outwards arranged at the periphery of the material gathering cavity by taking the material gathering cavity as the original point; the lower end part of a material inlet channel in the spure sleeve is communicated with the material gathering cavity; the end point of each horizontal material passage is connected with a corresponding vertical material passage; the vertical material passages are communicated with the pouring points of the cavity.