Proton exchange membrane water electrolysis system and control method thereof

The invention provides a proton exchange membrane electrolyzed water system and a control method thereof, and belongs to the technical field of electrolyzed water, the system comprises a water storage tank, a make-up pump, a pure water filter, a pure water make-up valve, an oxygen side gas-liquid separation tank and a proton exchange membrane electrolytic bath which are communicated in sequence, the hydrogen storage tank, the hydrogen output control main valve and the hydrogen side gas-liquid separation tank are communicated in sequence; a heater, a first liquid level sensor and a temperature sensor are arranged in the water storage tank, a water inlet valve is arranged on an inlet pipeline, the hydrogen side gas-liquid separation tank is further communicated with the proton exchange membrane electrolytic cell, and a pure water supply valve is arranged between the pure water filter and the oxygen side gas-liquid separation tank. And the proton exchange membrane electrolytic bath is also communicated with an o