A hydrogen production system, comprising: a renewable energy power generation system; a hydrogen production device; a main hydrogen branch; a mixed hydrogen branch; and at least one hydrogen storage device, wherein the renewable energy power generation system is configured to supply electric energy to the hydrogen production device for hydrogen production; the hydrogen production device is configured to: discharge acceptable-purity hydrogen to a first gas inlet of the main hydrogen branch through a first gas outlet of the hydrogen production device; and discharge unacceptable-purity hydrogen to a first gas inlet of the mixed hydrogen branch through a second gas outlet of the hydrogen production device; the mixed hydrogen branch is configured to receive high-purity hydrogen through a second gas inlet of the mixed hydrogen branch; the mixed hydrogen branch comprises two valves, wherein one of the two valves is configured to control a volume of the high-purity hydrogen flowing into a hydrogen mixing device in the mixed hydrogen branch, and the other of the two valves is configured to control a volume of the unacceptable-purity hydrogen flowing into the hydrogen mixing device in the mixed hydrogen branch, to control mixed hydrogen in the hydrogen mixing device to be the acceptable-purity hydrogen; and the at least one hydrogen storage device is configured to receive high-purity hydrogen from at least one of a purification branch in the main hydrogen branch or a purification branch in the mixed hydrogen branch, wherein the acceptable-purity hydrogen in the hydrogen mixing device is discharged to the purification branch in the main hydrogen branch, or the purification branch in the mixed hydrogen branch. a renewable energy power generation system; a hydrogen production device; a main hydrogen branch; a mixed hydrogen branch; and at least one hydrogen storage device, wherein the renewable energy power generation system is configured to supply electric energy to the hydrogen production device for hydrogen production; the hydrogen production device is configured to: discharge acceptable-purity hydrogen to a first gas inlet of the main hydrogen branch through a first gas outlet of the hydrogen production device; and discharge unacceptable-purity hydrogen to a first gas inlet of the mixed hydrogen branch through a second gas outlet of the hydrogen production device; the mixed hydrogen branch is configured to receive high-purity hydrogen through a second gas inlet of the mixed hydrogen branch; the mixed hydrogen branch comprises two valves, wherein one of the two valves is configured to control a volume of the high-purity hydrogen flowing into a hydrogen mixing device in the mixed hydrogen branch, and the other of the two valves is configured to control a volume of the unacceptable-purity hydrogen flowing into the hydrogen mixing device in the mixed hydrogen branch, to control mixed hydrogen in the hydrogen mixing device to be the acceptable-purity hydrogen; and the at least one hydrogen storage device is configured to receive high-purity hydrogen from at least one of a purification branch in the main hydrogen branch or a purification branch in the mixed hydrogen branch, wherein the acceptable-purity hydrogen in the hydrogen mixing device is discharged to the purification branch in the main hydrogen branch, or the purification branch in the mixed hydrogen branch.