Pretreatment device for domestic drinking water

The invention provides a pretreatment device for domestic drinking water, and relates to the technical field of drinking water purification devices. The pretreatment device comprises a water inlet pipe, an activated carbon pipe, a reverse osmosis membrane and ultrafiltration membrane combined pipe, an activated carbon and ultraviolet combined pipe and a water outlet pipe which are sequentially connected, wherein the front end of the water inlet pipe is provided with a water inlet pump and a water inlet stop valve; a sealing ring is arranged between the activated carbon pipe and the reverse osmosis membrane and ultrafiltration membrane combined pipe; the bottom of the reverse osmosis membrane and ultrafiltration membrane combined pipe is provided with an overflow hole; and a water outlet end of the water outlet pipe is respectively provided with a back-flushing pump and a back-flushing stop valve. The pretreatment device is simple in structure, small in volume, convenient to move, simple and easy to operate and rapid in treatment.