This machine utilizes four rolls which form two pairs of crumbing section,and the output is doubled. Compared with other double-roll crumblers with the same output,the rolls can be greatly shortened. Its manufacturing precision is high, processing is convenient,and production cost is low; material is evenly distributed on the rolls,and the crumbing efficiency is high. It is convenient to be used together with cooler and occupies small area.it is convenient for user to repair the tooth of roll,and the assembling and disassembling are easy.