Abstract: To solve the problems in the technology of converting straw into animal feed, including long fermenting cycle and taking up large space, and to realize the fast and efficient production of fermented straw feed, the continuous producing machine for fermented straw feed was designed based on the fermentation technology of the prior and partial degradation of the lignocellulose. A series of experiments with a period of 3 days was conducted by a continuous gradient way, using corn stalk, rice stalk and wheat stalk as materials respectively and applying the composite microbial system of MC1 as inoculants, and the producing machine was improved according to its performance during the experiment. The result showed that the producing machine performed best with corn stalk as stock, which became loose and soft after 3 days’ fermentation and a small quantity of hemicellulose while few cellulose and lignin was degraded. In conclusion, the continuous producing machine with lower energy consumption was simple to be operated and convenient to be used, and the period of fermentation was short. This machine developed is feasible to convert the corn stalk into animal feed efficiently and continuously.