The utility model discloses an environmental protection powder and dust extrusion forming machine, comprising a supply assembly and an extrusion forming assembly. Furthermore, the screw propeller of the extrusion forming assembly is arranged in a forming chamber. The utility model is characterized in that the forming chamber is composed of an extrusion shell and a tail pipe, and the tail pipe is provided with a pipe diameter adjusting device of the tail pipe. The powder and the dust of different characteristics with different particle thickness and unequal moisture are suitable to be processed, and the multiple uses of one pipe is achieved. At the same time, a material screw propelling particle forming chamber, a material screw propelling block forming chamber, a material propelling thinning rod forming chamber and a material thinning rod shaping forming chamber are formed between the forming chamber and the screw propeller which is arranged in the forming chamber. Therefore, continuous extrusion of four times for the materials is achieved. The materials are favourable to be formed, and the carbonization of the materials is avoided effectively. Furthermore, the utility model has the advantages of high efficiency, low energy consumption, stable operation, small noise, low failure rate, fast start-up formation, smooth bar stock outlet, non clogging, non loose and non cleaning after the machine is shut down.