NOVELTY - Household waste biological treatment device comprises a pond body, whose inner space is divided into a decomposition zone and a decompressing zone by a partition wall. A waste material and a sewage flowing passage is arranged at the lower part of the partition wall in two mutually connected decomposition zones. The last decomposition zone is connected to the first decompressing zone by the waste material and sewage flowing passage at the lower part of the partition wall. Two connected decompressing zones are connected by the waste material and sewage flowing passage.    USE - The household waste biological treatment device is useful for treating household waste, restaurant waste and kitchen waste.    DETAILED DESCRIPTION - Household waste biological treatment device comprises a pond body, whose inner space is divided into a decomposition zone and a decompressing zone by a partition wall. A waste material and a sewage flowing passage is arranged at the lower part of the partition wall in two mutually connected decomposition zones. The last decomposition zone is connected to the first decompressing zone by the waste material and sewage flowing passage at the lower part of the partition wall. Two connected decompressing zones are connected by the waste material and sewage flowing passage at the bottom of the partition wall. Airflow passages which are mutually connected are arranged at the top of the decomposition zone and the decompressing zone. The upper middle part of one side of the pond body is connected with the first decomposition zone and is provided with a material inlet and a dining kitchen waste material inlet. A biogas residue outlet is arranged at the bottom of the last connected decompressing zone, and a biogas liquid outlet is arranged on the upper side. The upper part of the pond body is connected with the decomposition zone and the decompressing zone and is provided with a biogas outlet. The decomposition zone and the decompressing zone are provided with a heating pipeline or a heat radiator respectively. A heating medium inlet and a heating medium outlet connected with the heating pipelines or heat radiators in the decomposition zone and the decompressing zone are correspondingly arranged outside the pond body. The heating medium inlet and the heating medium outlet are connected with a fuel gas boiler by a pipeline and the biogas outlet is provided with a biogas pipe, which is connected with the biogas major pipeline.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device.