The invention relates to a water treatment device, in particular to a drinking water filtering device which comprises an outer shell and a membrane component. The drinking water filtering device is characterized in that the outer shell of the device is a semi-closed circular cylinder, that is, one end is closed, and the other end is open; the outer shell is made of organic glass, the wall thickness is 5mm, the inside diameter is 75mm, and the length is 600mm; the ultrafiltration membrane is a bundling membrane, the size of the membrane component is that, the diameter is 75mm, the length is 586mm and the area of the membrane is 2m<2>; the ultrafiltration membrane is arranged in a cylindrical container of the outer shell, and the water outlet end of the membrane component just closes the other open end of the cylinder. Tap water permeates the membrane under the action of a free head after entering the container, and viruses, bacteria and other microbes are intercepted, thereby, the microbes are removed. Condensate can be regularly emitted, and the membrane component can be regularly cleaned by using sodium hypochlorite. The drinking water filtering device is used for the micro-pollution processing of a drinking water source.