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This invention discloses a fertilizer coating device, belonging to the field of fertilizer coating technology. It includes a fluidizing chamber with a discharge port at the bottom, providing a coating area; a discharge chamber located at the bottom of the fluidizing chamber, with at least a portion of the fluidizing chamber located inside the discharge chamber; and a spraying element rotatably disposed inside the discharge chamber, comprising a conical surface; a first spray groove on the conical surface; and a second spray groove on the radial outer wall of the spraying element. When the conical surface blocks the discharge port, the spraying element sprays gas into the bottom of the fluidizing chamber through the first spray groove and into the side walls of the fluidizing chamber through the second spray groove. This invention utilizes a double-groove spraying element with a circulating airflow path to construct a three-dimensional fluidization field, combined with multi-nozzle atomization spraying at the top, resulting in uniform coating thickness and no missed spraying. The conical surface also functions as a sealing and guiding element. Precise cylinder lifting and positioning, reliable gear transmission, and a combination of rail groove fitting and elastic sealing structure ensure smooth, uninterrupted movement.