Spraying device used in compound fertilizer production coating machine

The utility model relates to the technical field of film coating machines, in particular to a spraying device used in a film coating machine for compound fertilizer production, which comprises a mounting guide rail arranged in a film coating barrel, a first shell and a second shell are connected to the outer walls of two ends of the mounting guide rail in a sliding manner, and the first shell and the second shell are symmetrically arranged and have the same structure; a guide rod is fixedly connected to the inner wall of the mounting guide rail, a sliding block is slidably connected to the outer wall of the guide rod, one side of the outer wall of the sliding block is fixedly connected with the first shell, oil supply channels are formed in the two sides of the bottom of the first shell, and a plurality of nozzles which are evenly distributed and communicate with the oil supply channels are mounted at the bottom of the first shell. When the spraying device is used, the first shell and the second shell are ins