Method for preparing 2,4,5-triamino-6-hydroxypyrimidine sulfate

The invention discloses a method for preparing 2,4,5-triamino-6-hydroxypyrimidine sulfate. The method comprises the following steps of: dispersing 2,4-diamido-5-nitroso-6-hydroxy pyrimidine serving as a raw material in a surfactant-containing aqueous solution, and performing catalytic hydrogenation under neutral condition; and acidifying by using sulfuric acid to obtain the 2,4,5-triamino-6-hydroxypyrimidine sulfate. The method has the advantages of greatly reducing the consumption of acid and alkali, reducing production cost and improving the yield and purity of a final product, and is a more economic and environment-friendly clean process.