NOVELTY - Oxygen supply system comprises an air pressurizing and drying system (1), an absorption tower (2), an automatic switching valve set (5), an oxygen buffer tank (3), where the oxygen supply system is the oxygen in the air by pressure swing adsorption technology, is directly provided to a fermentation system using oxygen instead of air for oxygen, so that the oxygen concentration is increased, the oxygen supply system blowing flow rate of the fermentation system to be greatly reduced than the air, it does not cause the temperature of the gas flow over the lower drop.    USE - As an oxygen supply system for sludge oxygen enriched fermentation (claimed).    ADVANTAGE - The oxygen supply system has excellent reliability and high automatic degree; avoids excessive oxygen.    DETAILED DESCRIPTION - An oxygen supply system for sludge oxygen enriched fermentation, comprises air pressurizing and drying system (1), energy from pressurizing and air dried oxygen for continuously preparing alternating variable pressure adsorption and analysis of a absorption tower (2), the absorption tower are provided with capable of inputting air or discharging the bottom opening of the analysis gas can be the top of the output oxygen opening II, capable of controlling the adsorption tower alternate adsorption and analysis of the automatic switching valve set (5), where the automatic switching valve set comprises a absorbing switch valve (53) on the bottom opening and the top opening of each of the adsorption tower, connected with the analyzing switching valve on the bottom opening of each of the adsorption tower, connected with the two alternating voltage of the switching valve between the top opening of the absorption tower for absorption and analysis and a blowing switch valve, the opening can be through the top opening of the adsorption switch valve and the multi-adsorption tower is connected with the oxygen buffer tank.    DESCRIPTION OF DRAWING(S) - The figure shows sludge rich oxygen supplying system for garbage fermentation special oxygen supply system.    Air pressurizing and drying system (1)    Absorption tower (2)    Oxygen buffer tank (3)    Automatic switching valve set (5)    Absorbing switch valve (53)