NOVELTY - Air diffuser of organic residue fermentation field, comprises a main supply pipe for supplying air being buried in width direction at one side of a concrete floor surface (100) of the ferment field primary fermentation of food waste, multiple branch pipes (200), which branches in longitudinal direction of the ferment field after branching from the main supply pipe, and a air nozzles (210), which are provided such that to allow air to pass through the bottom surface of the concrete, where the diameter of the air nozzle at upper end is greater than formed widening part (220).    USE - Used as an air diffuser of organic residue fermentation field.    ADVANTAGE - The air diffuser ensure air supply automatically when the clogging of nozzle occurs to promote a smooth and efficient aerobic fermentation.    DETAILED DESCRIPTION - Air diffuser of organic residue fermentation field, comprises a main supply pipe for supplying air being buried in width direction at one side of a concrete floor surface (100) of the ferment field primary fermentation of food waste, multiple branch pipes (200), which branches in longitudinal direction of the ferment field after branching from the main supply pipe, and a air nozzles (210), which are provided such that to allow air to pass through the bottom surface of the concrete, and are installed on each of the branch with a number of predetermined intervals, where the diameter of the air nozzle at upper end is greater than formed widening part (220), which extends into a funnel shape. The distance to the bottom surface of the concrete from the upper end of the branch pipe is equal to the sum of the length of the air nozzles and the length of the widening part, in which the length of the air nozzles is greater than the length of the widening part. The maximum diameter of the widening part is greater than the twice the diameter of the air nozzles, and forms a tapered shape, in which the diameter change of the widening part is decreased from the maximum diameter to the diameter of the air nozzle.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the air diffuser of organic residue fermentation field.    Concrete floor surface (100)    Branch pipes (200)    Air Nozzle (210)    Widening part (220)