The utility model provides a device of holding concurrently oxygen digested sludge, including just heavy pond, ultrasonic treatment pond, the oxygen fermentation vat of holding concurrently, dehydration pond, backwash pump, temperature sensor, pH monitoring device, biogas collection apparatus, agitating unit, for the oxygen device, flow monitoring device, flow valve, heat preservation, supersonic generator. The utility model discloses a device of holding concurrently oxygen digested sludge, be provided with ultrasonic surgical instrument, the efficiency of sludge treatment is improved, mud mixture slaking required time has been shortened, the volume of sludge digestion structures has been reduced, further processing for mud is got ready, the oxygen fermentation vat of holding concurrently is provided with the temperature, PH monitoring device stirring and for the oxygen device, fully going on of the oxygen digestion reaction of holding concurrently has been guaranteed, and be equipped with biogas collection apparatus, thereby the utilization efficiency of mud has been improved, the harm of mud to the environment has been reduced.