NOVELTY - Producing ammonium phosphate comprises using a device comprising reaction part, product output part, exhaust gas discharging part, and residual washing and recycling part. In the reaction part, an ammonifying reactor, a II effect flash chamber (2) and a I flash chamber (3) are sequentially in communication via a pipeline; a reaction circular pump (5) is mounted on the ammonifying reactor (1), and a II effect circular pump (6) is mounted on the II effect flash chamber and a I effect circular pump (7) is mounted on the I flash chamber.    USE - Method for producing ammonium phosphate (claimed).    ADVANTAGE - The method can save energy, and reduces emission.    DETAILED DESCRIPTION - Producing ammonium phosphate comprises using a device comprising reaction part, product output part, exhaust gas discharging part, and residual washing and recycling part. In the reaction part, an ammonifying reactor, a II effect flash chamber (2) and a I flash chamber (3) are sequentially in communication via a pipeline; a reaction circular pump (5) is mounted on the ammonifying reactor (1), and a II effect circular pump (6) is mounted on the II effect flash chamber and a I effect circular pump (7) is mounted on the I flash chamber. In the product output part, a pelletizing machine (9), a drying machine (10), a returned material conveying machine, a breaking machine and a sieving machine are included; and an ammonium phosphate slurry pump is mounted between the pelletizing machine and the I flash chamber. The exhaust gas discharging part comprises a cyclone dust collector, a Venturi washer and a gravity settling chamber. The cyclone dust collector communicates with the pipeline between the pelletizing machine and the drying machine. The residual washing and recycling part comprises washing circular tank, purifying pond and ammonium phosphate slurry collecting tank. The washing circular tank is provided with a residual washing circular pump and communicates with the Venturi washer and the purifying pond via the pipeline respectively. The purifying pond is provided with a purifying pond liquid cleaning pump and communicates with the washing circular tank via the pipeline. The purifying pond is provided with a purifying pond slurry pump and communicates with the ammonium phosphate slurry collecting tank via the pipeline. The ammonium phosphate slurry collecting tank is provided with a collecting tank circular pump and communicates with the ammonifying reactor via the pipeline.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a device for producing ammonium phosphate.    Ammonifying reactor (1)    Flash chambers (2, 3)    Circular pumps (5-7)    Pelletizing machine (9)    Drying machine (10)