The invention relates to the technical field of a paperboard, in particular to an environment-friendly composite packaging paperboard. The environment-friendly composite packaging paperboard comprisesa filling layer; one side of the filing layer is connected with a reinforcing layer; spherical elastomers are distributed on the reinforcing layer uniformly; the side, far away from the filling layer, of the reinforcing layer is connected with an adhesion layer; the side, far away from the reinforcing layer, of the adhesion layer is connected with a first waterproof layer; the other side of the filling layer is connected with a buffer layer; strip-shaped elastic pads are arranged on the side, connected with the filling layer, of the buffer layer equidistantly; the side, far away from the filing layer, of the buffer layer is connected with a heat-insulating layer; and the side, far away from the buffer layer, of the heat-insulating layer is connected with a second waterproof layer. The environment-friendly composite packaging paperboard is provided with the filling layer and the heat-insulating layer to improve the heat-insulating capability; the environment-friendly composite packaging paperboard is provided with the buffer layer, the elastic pads and the elastomers to improve the buffer capability of the paperboard; furthermore, the environment-friendly composite packaging paperboard is provided with the reinforcing layer to improve the whole structure strength of the paperboard, so that the paperboard can meet the packaging requirement of various transportation products.