The present invention provides a treatment method for wastewater from a straw pulp papermaking intermediate section, which employs a combined process of iron-carbon internal electrolysis pretreatment, UASB (upflow anaerobic sludge blanket) anaerobic treatment, high-efficiency activated sludge aerobic treatment and advanced treatment of a biological aerated filter and comprises the following stepsof: adjusting the straw pulp papermaking wastewater to be slightly acidic with diluted sulfuric acid, introducing the wastewater to an iron-carbon internal electrolysis reactor for iron-carbon internal electrolysis treatment, adjusting the pH value of the effluent of the iron-carbon internal electrolysis reactor to 10 for coagulation and sedimentation, then introducing into a UASB reactor for anaerobic treatment, introducing the effluent of the UASB reactor into a high-efficiency activated sludge reactor, mixing the effluent of the high-efficiency activated sludge reactor with part of returned effluent from the biological aerated filter and introducing to the biological aerated filter for advanced treatment. The treatment method combines the pre-treatment, secondary treatment and advancedtreatment processes of the wastewater from the straw pulp papermaking intermediate section and achieves the standardized discharge of the wastewater from the straw pulp papermaking intermediate section, and simultaneously the sections have good complementarity, so that other sections can guarantee the standard of the final treated effluent when any section goes wrong, so as to guarantee good stability.