Ammonium polyphosphate preparation device with controllable nutrients

The utility model discloses a nutrient-controllable ammonium polyphosphate preparation device, which is characterized by comprising a mixer, a feeding pump, a distributor, a belt type polymerizer, a scraping device and a crushing device, the mixer is connected with the distributor through the feeding pump, the distributor is positioned above a feeding hole of the belt type polymerizer, the scraping device is positioned above the feeding hole of the belt type polymerizer, and the crushing device is positioned above the scraping device. The mixing device is arranged on the belt type polymerizer and can uniformly spray the mixed slurry in the mixer on the belt type polymerizer, the scraping device is located at a discharge port of the belt type polymerizer and is used for scraping the cured ammonium polyphosphate from the belt type polymerizer, a belt type conveying device is arranged below the discharge port of the belt type polymerizer, and the crushing device is located at the discharge end of the belt type c