Abstract: Water electrolysis performed on self-designed centrifuge galvanostatically under different super gravity field, which investigated the relationship between cell voltage, super gravity coefficient and pore size of nickel foam. The results showed that super gravity field could significantly enhance the efficiency of water electrolysis, and obviously reduce the cell voltage under high super gravity coefficient and current density. The reduction of cell voltage depended on the pore size of the nickel foam. When the nickel foam with smaller pore size was used as the electrode, the cell voltage reduction was close to that of the nickel plate; while nickel foam with large pore size could increase the cell voltage drop and save energy under super gravity field. In order to reduce the cell voltage, the critical condition between nickel plate and foam electrode electrolysis efficiency was investigated.