The invention provides a modified starch production waste water treatment method, which relates to a starch production waste water treatment method. The invention solves the problems of environment pollution and water resource pollution caused by poor effect of the existing modified starch production waste water treatment method. The method of the invention comprises the following steps: regulating pH after waste water sedimentation; and then, sequentially passing through a coarse filter, a primary active carbon filter, a first fine filter, an ultrafiltration membrane system, a secondary active carbon filter, a second fine filter and a reverse osmosis membrane system to obtain recovered water. The method of the invention has the advantages of simple process, low cost, low operation cost and good waste water treatment effect. The recovered water obtained by the method of the invention has clear and transparent water quality, the pH valve is between 7.0 and 7.5, the average salt rejection reaches 99 percent, the electrical conductivity reaches 23 mus/com, the salinity reaches 0.04 psu, the total solid content reaches 15.2 mg/L, and each index of the recovered water is basically the same as each index of tap water. The invention reaches the national third-grade or second-grade discharge environment protection requirements, and can realize the effect of recycling reuse.