Device and method for controlling pressure in hydrogen production device

The invention discloses a device and method for controlling the pressure in a hydrogen production device. Specifically, the device comprises a gas production assembly, a pressure control assembly, a pressure control module and an electronic control assembly, wherein the gas production assembly comprises a gas production module, an anode chamber and a cathode chamber; the pressure control module comprises a diaphragm, a pushing rod, a spring and a spring cover plate; the diaphragm is used for partitioning the cathode chamber from the pressure control assembly; the pushing rod comprises a pushing rod head and a pushing rod tail; the pushing rod head makes contact with the diaphragm; the pushing rod head is provided with an outer edge protruding outwards in the radial direction of the pushingrod; the pushing rod is sleeved with the spring; one end of the spring abuts against the outer edge; the other end abuts against the spring cover plate; the spring cover plate is provided with a hole, and the pushing rod pen