A membrane treatment method for treating trace antimony in drinking water comprises the following basic processes: after pre-precipitating and sterilizing pumped antimony-containing source water in a sterilization buffer pool, coagulating the source water in a coagulation pool and precipitating the source water in a precipitation pool, pressurizing the source water by a primary booster pump, filtering the source water by a multi-media filter and a precision filter, pressurizing the source water by a secondary booster pump and the sending the source water to a membrane treatment system to be treated. Nanofiltration or reverse osmosis membrane separation equipment is adopted for membrane separation, cross filtration technology is adopted for membrane filtration and physical cleaning and chemical cleaning are combined for cleaning the membrane separation equipment. Adopted for treating the drinking water contaminated by antimony, the membrane technology has high degree of automation, is mature and stable and ensures the energy consumption to be not more than 0.4kwh/m3, the working pressure of the membrane to be (0.15-0.75)MPa and the service life of the membrane to be not less than 3 years. When the content of antimony in the source water is (5-100)mu g/L, the content of the heavy metal antimony in the product water (permeate) after separation treatment is not more than 5mu g/L (GB5749-2006) and the contents of lead, mercury, arsenic and other heavy metals and pesticide residues in the tap water are simultaneously lowered, thus obviously promoting the water quality.