The invention discloses a sewage treatment method with characteristics of zero emission of sewage and sludge. According to the sewage treatment method, sewage is introduced into a flocculation pool, the pH value is adjusted to 6-9 with an alkali, lime or an acid, and a composite flocculant comprising aluminum sulfate and polyacrylamide is added; according to the composite flocculant, a solution with a weight ratio of 45-65% is prepared from refined industrial aluminum sulfate, the adding amount of the solution is 100-1500 ppm, the adding amount of polyacrylamide is 0.1-3 ppm, stirring is performed for 20-50 min at a speed of 90-150 rpm to form floc, the floc is introduced into a sedimentation pool, and the floc grows and sink in the sedimentation pool; the upper portion of the sedimentation pool is colorless and translucent clear water, and the colorless and translucent clear water is introduced into a clear water pool and is recycled; the sludge on the lower portion of the sedimentation pool is pumped into a sludge treatment pool and is treated, the pH value is adjusted to 3-5 with sulfuric acid or hydrochloric acid, aluminum hydroxide is dissolved to form an aluminum salt solution, layering is performed, the supernatant is used as a flocculant for recycling, and the recovery rate of aluminum sulfate is 70-87%; and the precipitate on the lower portion of the sludge treatment pool is neutralized with an alkali or lime to achieve a neutral state so as to be used as an organic fertilizer. With the method of the present invention, the zero emission of sewage and sludge is achieved, the comprehensive cost of the sewage treatment is low, or the slight earning is achieved, and the positive contributions are provided in the development of local economy and environmental protection.