The invention discloses an integrated roll shaft spraying mechanism for a prepreg gluing machine. The integrated roll shaft spraying mechanism comprises a first arc-face half shell, a second arc-face half shell, a third arc-face half shell and a fourth arc-face half shell. The sections of the first arc-face half shell, the second arc-face half shell, the third arc-face half shell and the fourth arc-face half shell are in sector shapes, and the first arc-face half shell, the second arc-face half shell, the third arc-face half shell and the fourth arc-face half shell are coaxial and are surrounded together in sequence to form a spraying cavity. Automatic control is adopted, a very efficient novel roll shaft manufacturing manner is achieved, the rate of finished products is high, and the effect is good.