Raw water (pure water) is sent into the raw water tank, which enters the pipeline through a valve. It is then injected into the hydrogen oxygen comprehensive tower through a make-up water pump, and finally enters the electrolytic cell through the alkali circulation pump, alkali filter, etc. in the lower pipeline of the hydrogen oxygen separator. The electrolytic cell produces hydrogen and oxygen under direct current electrolysis. Hydrogen and oxygen enter the alkali cooler for cooling, the hydrogen and oxygen separator for separation, and washing (hydrogen needs to be further condensed) through pipelines. The water separated from the gas water separator is discharged through a drain. Oxygen is output from the regulating valve through the oxygen outlet pipeline, usually for venting. Hydrogen gas is processed from the hydrogen comprehensive tower and then enters the gas water separator through pipelines for treatment. The output is then regulated by a control valve for use in the production line