Spray beam capable of automatically adjusting air injection quantity

The utility model discloses a spray beam capable of automatically adjusting air injection quantity. The spray beam comprises a compressed air pipeline, the first spraying beam is connected with the compressed air pipeline through a first hose, and the first hose is connected with a first electromagnetic valve; the two sections of second spraying beams are fixedly connected to the two sides of thefirst spraying beam correspondingly, the two second spraying beams are connected through a first hard pipe, the first hard pipe is connected with the compressed air pipeline through a second hose, anda second electromagnetic valve is connected to the second hose; according to the utility model, one section of spray beam is changed into the first spray beam, the second spray beam, the third spraybeam, the fourth spray beam and the fifth spray beam with different lengths; a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnet