Painting device for spring

The invention relates to a painting device for a spring, which comprises a machine frame; a horizontal movement air cylinder and a guide rail are installed at the upper end of the machine frame; a slide block is arranged on a piston rod of the horizontal movement air cylinder, is arranged on the guide rail and can move back and forth along the guide rail; the slide block is fixedly connected with a painting air cylinder and a paint scraping air cylinder; a paint taking board and a paint scraping board are arranged at the end part of the piston rod of the paint scraping air cylinder; the painting air cylinder is a double-piston rod air cylinder; the end part of a piston rod of the painting air cylinder is connected with two painting heads; and a paint board is installed below the paint scraping air cylinder and the painting air cylinder, a paint tank is arranged at one end of the paint board, and the other end of the paint board is a painting plane. A sensor capable of sensing the distance between the spring a