The invention relates to the water purification field, and discloses a domestic wastewater purifying treatment method. The method comprises the following steps: 1, allowing domestic wastewater to stand, and allowing the domestic water to go through a filter screen in order to remove granular impurities; 2, adding beta-cyclodextrin magnetic particles accounting for 1-2% of the mass of the domestic wastewater to the domestic wastewater obtained in step 1, allowing the obtained domestic wastewater to stand for 8-12 h, and recovering the beta-cyclodextrin magnetic particles by using magnet; 3, loading the domestic wastewater obtained in step 2 to a foam separation tower, carrying out bubbling treatment, separating a foam layer, and taking the obtained lower layer domestic wastewater; and 4, introducing the domestic wastewater obtained in step 3 into an oil-water separation tower, and carrying out oil-water separation, wherein the oil-water separation tower adopts composite aerogel as a filler. The method has the advantages of good filtering effect on the granular impurities, protein substances, oil stains and heavy metals, no recovery of a purifying agent, and no secondary pollution to water.