Provided is a dissolved oxygen measurement system. The dissolved oxygen measurement system includes a hydrogen storage device storing hydrogen, a first hydrogen fuel cell in which the hydrogen stored in the hydrogen storage device and water supplied from the outside in real time react with each other to generate first electricity energy, a water storage tank storing the water supplied from the outside, a second hydrogen fuel cell in which the water supplied from the water storage tank and the hydrogen stored in the hydrogen storage device react with each other to generate second electricity energy, and a control unit analyzing a difference between the first electricity energy and the second electricity energy.