The invention relates to the technical field of porcelain insulator production, discloses a spraying device for porcelain insulator production and a spraying method of the spraying device, and solves the problem that the thicknesses of coatings on two sides are easy to be nonuniform due to nonuniform spraying at multiple positions caused by manual spraying at present. The spraying device comprises a bottom plate, support legs are fixedly connected to the positions, close to the four corners, of the bottom of the bottom plate, a discharging port is fixedly formed in the middle of the bottom of the bottom plate, and an electromagnetic valve is fixedly installed on the outer side of the discharging port. According to the invention, through cooperation between a driving gear and a driven gear, when a transmission shaft rotates, a rotating shaft can be rotated, and through cooperation between the rotating shaft and a connecting column and cooperation between an inner groove and an outer block, the connecting column is rotated, and then a left fixing unit is rotated, so that a porcelain insulator is rotated, the coating can be sprayed to each surface of the porcelain insulator, and the spraying of the porcelain insulator is uniform.