The invention provides an integral device for treating domestic sewage by a sludge bed and a domestic sewage treatment method, and relates to a domestic sewage treatment device and a sewage treatment method, which mainly aims at solving the problem of treatment of urban, regional and rural domestic sewage under the conditions of scarce land occupation area and lack of technicians. The domestic sewage treatment device comprises an anaerobic contact tank, an aerobic contact tank, a sedimentation tank, a mixing tank, a filtering tank, a submersible lifting pump, a submersible stirring machine, a flow distributer, a contact tank blower, a tubular aerator, an air collecting cover, a filler, and a sedimentation tank blower. The sewage treatment method comprises the following steps of 1, firstly, sending the sewage into a conditioning tank, lifting to the anaerobic contact tank, starting the stirring machine, and enabling the water from the anaerobic contact tank to flow into the aerobic contact tank; 2, starting the contact tank blower, aerating, and enabling the water from the aerobic contact tank to flow into the sedimentation tank; 3, starting the sedimentation tank blower, enabling the water from the sedimentation tank to flow into the mixing tank, and feeding a coagulant; 4, enabling one part of the water from the mixing tank to flow into the filtering tank, and enabling the other part of the water to flow back into the mixing tank. The domestic sewage treatment device and the sewage treatment method are applied to the field of sewage treatment.