The invention discloses a system and a method for treating village sewage. The system comprises a pretreatment tank, an adjusting tank, a biochemical treatment tank, a secondary sedimentation tank and a disinfecting tank, all of which are orderly connected together; the secondary sedimentation tank is provided with a first sludge discharge opening; the adjusting tank is provided with a second sludge discharge opening and a reflux inlet; a concentrated sludge storage tank is provided with a liquid supernatant return pipe, a sludge receiving opening and a sludge outlet, wherein the liquid supernatant return pipe is connected to the reflux inlet of the adjusting tank; a first movable sludge suction device is connected to the second sludge discharge opening of the adjusting tank in a sludge suction state and connected to the sludge receiving opening of the concentrated sludge storage tank in a sludge discharge state; a second movable sludge suction device is connected to the first sludge discharge opening of the secondary sedimentation tank in the sludge suction state and connected to the sludge receiving opening of the sludge storage tank in the sludge discharge state; and a movable sludge dewatering device is connected with the sludge output opening of the sludge storage tank. According to the system, the movable sludge treatment devices are adopted based on the characteristics of the sludge of a village sewage plant, the flow is simplified, intensive management can be realized conveniently, the investment and operating costs are low, village sludge recycling is realized and secondary pollution is avoided.