Low-oxygen aeration sewage biological treatment device

The utility model relates to the field of sewage treatment, and discloses a low-oxygen aeration sewage biological treatment device which comprises an anaerobic tower, a water inlet pipe and a filter plate which is obliquely arranged in the water inlet pipe, the discharging groove is formed in the bottom of one side, far away from the anaerobic tower, of the filtering plate; the collecting box is fixed at the bottom of the water inlet pipe; the extension rod is mounted at the center line position in the collecting box; the scraping plates are divided into four groups which are fixed on the surface of the extension rod at equal intervals; the first motor is installed on one side of the collecting box. According to the utility model, the filter plate is arranged in the water inlet pipe, the filter plate is used for filtering large-particle sludge in sewage entering the anaerobic tower, the problem that the sludge sinks to the bottom of the anaerobic tower after entering the anaerobic tower is reduced, and the bi