NOVELTY - Manufacturing sodium humate and by-product pulp from cassava dregs comprises: (a) soda boiling; (b) recycling the fiber; (c) acid analyzing; (d) treating the waste liquid; (e) preparing the sodium humate; and (f) soda recovery.    USE - The method is useful for manufacturing sodium humate and by-product pulp from cassava dregs (claimed) used as industrial raw materials, such as ceramic additive, peptizing agent, bore mud adjusting agent and industrial water stabilizing agent; as the compound fertilizer in agriculture; as feed additive in the poultry breeding field; and as potentiating agent in aquaculture.    ADVANTAGE - The cassava dregs can be used completely to obtain sodium humate, pulp and calcium sulfate products. It can avoid second pollution with better economic benefits.    DETAILED DESCRIPTION - Manufacturing sodium humate and by-product pulp from cassava dregs comprises: (a) soda boiling: the cassava dregs after extracting the starch is added to 1-1.5 times of the sodium hydroxide water solution whose weight content is 1-3%; it is heated to boil in the container; it is continuously heated for 0.5-1 hour; and then it is pressed and filtered; so the fiber is taken out; (b) recycling the fiber: after being washed by the water, the fiber is the crude pulp; after being bleached and beaten, adding the long fibers so as to be manufactured into the paper; the water for washing the fiber is also used for washing the cassava; (c) acid analyzing: the solution after pressing and filtering the fiber in step (a) is added to the diluted sulfuric acid whose weight content is 40-70%; the pH value of the solution is adjusted to 5-5.5; the solid phase and the liquid phase are separated by the centrifugal or filter-press methods; the solid phase is the humic acid; (d) treating the waste liquid: the solution after separating the solid in step (c) is added to the calcium hydroxide whose weight content is 5-10%; and then it is precipitated; the solid is the calcium sulfate; (e) preparing the sodium humate: the liquid phase for separating the calcium sulfate comprises the sodium hydroxide; the liquid obtained in step (d) is partially added to the solid phase humic acid in step (c); the sodium hydroxide reacts with the humic acid; afterwards, the water-soluble sodium humate is generated; and then it is heated and concentrated so as to obtain the pasty sodium humate; it is dried so that the sodium humate product is obtained; and (f) soda recovery: the liquid obtained in step (d) is partially and chemically analyzed; when the soda content is in 1-3%, it returns to the soda boiling process or is used as the water capable of steeping the cassava dregs circularly; when the soda content is not enough, it is adjusted by adding the solid caustic soda.