In order to improve the mixing effect, the inner side of the mixing cylinder is equipped with a flying knife group directly driven by the motor. When mixing the material, the material thrown out and in circular turbulence passes through the flying knife group and is quickly and forcefully thrown by the high-speed rotating flying knife, so that the material can achieve uniform mixing in a short time under the composite action of the blade and the flying knife, and the quality of the material mixing is higher.