Extrusion system production line of expansion cereals is fit for making various kinds of expansion foods, which uses corn and rice as raw materials by changing different moulds. The main machine is PH-single-screw expansion machine or TS-twin screw expansion machine, expansion cereals product extruded from either of the above main machine can be processed into different kinds of stuffed cereals expansion food through ZX-shapping machine and JX-stuffing machine. Products made by the production line are crisp even without frying.