The invention relates to a method for treating micro-polluted water, and provides the method for treating the micro-polluted water by using attapulgite clay as an adsorbent for carrying out pretreatment and coupling with membrane separation. Through the pretreatment of adding the attapulgite clay into a membrane feeding solution, so that COD (Chemical Oxygen Demand), nitrogen, phosphorus, turbidity and contents of various organic matters in the micro-polluted water can be remarkably reduced, the concentration of heavy metal ions in water can be reduced, a function of reducing membrane pollution can be achieved, membrane flux can be improved, and high-quality water can be more easily obtained. A certain amount of acidified attapulgite clay is firstly added in raw water in a water inlet tank1 in advance, a mechanical stirring device can be simultaneously started, suction can be carried out through a booster pump 3, the pressure is controlled to be 0.1MPa, and then separation is carriedout through a membrane assembly 4 (a hollow or flat sheet membrane); during a process, backwashing valves 10 and 11 and a backwashing water outlet valve 13 can be switched off, water inlet valves 5 and 7 and a water outlet valve 9 can be switched on, and differential pressure of a membrane can be read through pressure gauges 6 and 8 arranged on two ends of the membrane assembly.