NOVELTY - An urban garden green waste biological treatment system comprises a mixing system, a distributing system, a turning system, an oxygen supply system, a screening system, and deodorization system and each system is connected to the production line. The mixing system is connected with a fermentation material transporting device for passing fermentation material into main material hopper and auxiliary material adding storage bin, and putting all materials to the mixer by a conveying device. The oxygen supply system introduces fresh air from the outside to a composting fermentation tank.    USE - Urban garden green waste biological treatment system.    ADVANTAGE - The biological treatment system has high biological treatment rate and high screening efficiency and low energy consumption, and requires small floor space.    DETAILED DESCRIPTION - An urban garden green waste biological treatment system comprises a mixing system, a distributing system, a turning system, an oxygen supply system, a screening system, and deodorization system and each system is connected to the production line. The mixing system is sequentially connected from upstream to downstream with a feeding device, a main storage bin connected with a metering device, a mixing tank connected with metering device, a feeding mechanism, and a plate having function to monitor a transport mixer. The mixing system is further connected with a fermentation material transporting device for passing fermentation material into main material hopper and auxiliary material adding storage bin, and putting all materials to the mixer by a conveying device. All materials are primarily mixed in the feeding mechanism, and then sent to a mixing machine via the conveying device for biological treatment. The distributing system is connected with the mixing machine upstream and connected with a belt conveyor and a movable material-distributing machine downstream. The turning system is connected with a platform capable of moving and stacking and a set of discharging device. The material is discharged via cooperation of the belt conveyor and a dumper finishing primary fermentation clinker of sieving hopper system. The oxygen supply system is located on a primary fermentation device and introduces fresh air from the outside to a composting fermentation tank. The deodorization system is provided with a set of secondary washing deodorization purification system. An INDEPENDENT CLAIM is included for urban garden green waste biological treatment, comprising:    (A) adjusting fermentation raw material by mixing crushed branches, leaves, grass or other raw material;    (B) sending fermentation material via a fermentation material transporting device into main material hopper and auxiliary material adding storage, then to the mixer by the conveying device, performing primary mixing, and after mixing, conveying to a distributing system;    (C) adjusting water content of the material to obtain compost raw material for fermentation;    (D) performing biological treatment, discharging fermentation material, sieving, reducing water content, and then composting the material by secondary fermentation;    (E) adjusting ventilation amount according to stack reaction condition and reaction temperature by supplying oxygen and cooling; and    (F) absorbing pollutant in the odor, decomposing, purifying the gas after treatment to meet national discharge standard, and monitoring.