Coating machine capable of detecting gluing thickness on line

The utility model discloses a coating machine capable of detecting the gluing thickness on line, which comprises a coating machine base body, a drying oven for drying and a glue storage tank fixedly arranged on the outer wall of one side of the coating machine base body, a coating roller is rotatably connected between two opposite side walls of the glue storage tank through a bearing, a film base body is arranged on the outer wall of the coating roller, and the film base body is arranged on the outer wall of the film base body. The film comprises a film base body and a cassette, strip-shaped openings allowing the film base body to pass through are formed in the outer walls of the two opposite sides of the cassette, a light emitter is fixedly installed on the top of the inner wall of the cassette, a lighting device is fixedly installed at the bottom of the inner wall of the cassette, and the lighting device and the light emitter are located on the two sides of the film base body. According to the coating machi