An agricultural air injection apparatus comprising: a compressor for compressing air; an air tank which has a pressure gauge and a safety valve for presenting overpressure and stores compressed air of high pressure in a set pressure condition; a decompression valve for decompressing air pressure discharged from the air tank ; a sprayer for spraying water in a particle state in order to make vapor contained in the supplied air; a distributor which uniformly distributes the decompressed air to a plurality of flow paths and has a control valve to open and close the flow paths; an air supply pipe which is buried in the soil where crops to be cultivated will be planted and has pores for supplying air passing through the distributor ; and a controller which is connected to the compressor , the pressure gauge of the tank and the control valve of the distributor to control supply of the compressed air, characterised in that the air supply pipe comprises: a first temporary pipe and a second temporary pipe which are buried to a low depth in the soil and are branched at different depths to directly supply air to the roots of the crops; a drain pipe and a liquid fertilizer supply pipe which are respectively piped to the first temporary pipe and the second temporary pipe to supply water and liquid fertilizer if necessary; a fixed pipe which is fixed and mounted in the soil to be deeper than the temporary pipes; and a nonwoven fabric which surrounds the outer circumference of the fixed pipe and a wire mesh put on the outer surface of the nonwoven fabric in order to block inflow of foreign matters into the fixed pipe and prevent blocking of the pores . a compressor for compressing air; an air tank which has a pressure gauge and a safety valve for presenting overpressure and stores compressed air of high pressure in a set pressure condition; a decompression valve for decompressing air pressure discharged from the air tank ; a sprayer for spraying water in a particle state in order to make vapor contained in the supplied air; a distributor which uniformly distributes the decompressed air to a plurality of flow paths and has a control valve to open and close the flow paths; an air supply pipe which is buried in the soil where crops to be cultivated will be planted and has pores for supplying air passing through the distributor ; and a controller which is connected to the compressor , the pressure gauge of the tank and the control valve of the distributor to control supply of the compressed air, characterised in that the air supply pipe comprises: a first temporary pipe and a second temporary pipe which are buried to a low depth in the soil and are branched at different depths to directly supply air to the roots of the crops; a drain pipe and a liquid fertilizer supply pipe which are respectively piped to the first temporary pipe and the second temporary pipe to supply water and liquid fertilizer if necessary; a fixed pipe which is fixed and mounted in the soil to be deeper than the temporary pipes; and a nonwoven fabric which surrounds the outer circumference of the fixed pipe and a wire mesh put on the outer surface of the nonwoven fabric in order to block inflow of foreign matters into the fixed pipe and prevent blocking of the pores . a first temporary pipe and a second temporary pipe which are buried to a low depth in the soil and are branched at different depths to directly supply air to the roots of the crops; a drain pipe and a liquid fertilizer supply pipe which are respectively piped to the first temporary pipe and the second temporary pipe to supply water and liquid fertilizer if necessary; a fixed pipe which is fixed and mounted in the soil to be deeper than the temporary pipes; and a nonwoven fabric which surrounds the outer circumference of the fixed pipe and a wire mesh put on the outer surface of the nonwoven fabric in order to block inflow of foreign matters into the fixed pipe and prevent blocking of the pores . <EOS>