NOVELTY - Purification of water electrolysis hydrogen comprises performing water electrolysis to obtain trace amounts of oxygen and saturated water-containing hydrogen gas, feeding into deoxidation tower remove impurities, and feeding into dehumidification drying tower to obtain high-purity hydrogen.    USE - Method for purification of water electrolysis hydrogen (claimed).    ADVANTAGE - The method achieves purification of hydrogen for as low as - 80 degrees C dew point of hydrogen. The device simplifies the process, and it has simple and convenient post-maintenance and replacement.    DETAILED DESCRIPTION - Purification of water electrolysis hydrogen comprises performing water electrolysis to obtain trace amounts of oxygen and saturated water-containing hydrogen gas, feeding into deoxidation tower remove impurities, and feeding into dehumidification drying tower to obtain high-purity hydrogen. The purification is carried out by:    (A) feeding hydrogen into first drying tower at full operating pressure, dehumidifying, dividing product into 90% hydrogen first part and 10% renewable hydrogen second part, and feeding hydrogen first part to subsequent production unit;    (B) feeding renewable hydrogen into second drying tower, releasing pressure to atmospheric pressure, heating to 100-120 degrees C using desiccant, absorbing water, recycling desiccant, and cooling hydrogen while venting first regenerated gas; and    (C) feeding hydrogen into hydrogen into second drying tower at full operating pressure, dehumidifying to obtain high purity hydrogen, dividing into 10% hydrogen first part and 90% renewable hydrogen second part, and feeding hydrogen first part to subsequent production unit; and feeding renewable hydrogen into first drying tower, releasing to atmospheric pressure, heating to 100-120 degrees C using desiccant, absorbing water, recycling desiccant, and cooling hydrogen while venting second regenerated gas.    An INDEPENDENT CLAIM is included for water electrolysis hydrogen purification device comprising deoxidation tower, first cooler provided with connection terminals, second cooler, first drying tower, second drying tower, and four-way valve provided with ports.