With liquid ammonia as raw material, in the presence of catalyst heating breaks down into 75%, nitrogen-hydrogen 25% of hydrogen-nitrogen mixed gas (Chemical formula: 2NH3 ? 3H2+N2), and then by PSA devices removing gas mixture of nitrogen, hydrogen purification to 99.5%~99.99%. Main technical index: Production: 5~100 Nm3/h Hydrogen purity: 99.5~99.99% Dew point:-10 ? Hydrogen extraction rate: ¡ý 85%