Pulping method of pulping machine

The invention relates to a pulping method of a pulper. The pulping process at least comprises a pre-heating stage, a pre-crushing stage, a circulating heating stage, a circulating crushing stage and a circulating pulp cooking stage; because of the added pre-heating stage and the pre-crushing stage in the pulping process, the pulping method of the pulper can directly add dried bean and other pulping materials into a pulping container for pulping, and the pulping materials do not need to be pre-soaked, so the method has the advantages of simple pulping process and quite short pulping time.