The invention discloses a method for constructing a particle cluster discrete element model of a convex polyhedral aggregate in any shape. The method comprises the following steps of performing topological information retrieval on a boundary model of the convex polyhedral aggregate in any shape, and establishing a topological information library of the model, wherein the topological information library includes a vertex information library, an edge information library and a surface information library; and performing retrieval on the surface information library, the edge information library and the vertex information library separately, traversing all triangular surfaces, all edges and all vertexes of the model, and putting spheres on the surfaces, the edges and the vertexes in sequence until the spheres cannot be successfully put on the surfaces, the edges and the vertexes. The method for constructing the particle cluster discrete element model of the convex polyhedral aggregate in any shape is simple in thought, easy to realize by programming and relatively small in computing error, and a deformation law better conforms to a deformation state of an actual test piece; and through simulation experiment analysis, the effectiveness and high-precision characteristic of the method for constructing the particle cluster discrete element model are verified.