Abstract: A process is disclosed for the production of water soluble ammonium phosphates, comprising the following steps:(a) to react in a reaction step ammonia and untreated phosphoric acid with P.sub.2 O.sub.5 concentration comprised within the range of from 30 to 54%, outcoming from wet processes;(b) to filter under high temperature conditions the reaction suspension, separating the impurity-containing sludges from an aqueous solution of ammonium phosphate;(c) to cool and crystallize the aqueous solution of ammonium phosphate;(d) to separate the formed ammonium phosphate crystals from the mother liquors.