A test-bed was designed for cutting and rubbing straw, an experiment was carried out by cutting and rubbing corn straws with 75% moisture content. By means of orthogonal experimental analysis, the best parameters of this device were as follows: the spindle speed of 1000r/min, multiple saw cutting blade, three hammers and feeding speed of 0.88m/s. The result shows that when cutting and rubbing corn straw with 75% moisture content, the breaking rate is higher than 96%.