The experiment of nickel electroforming with non-ionic surfactant was carried out under supercritical CO2 fluid. The effects of current density on microstructure, Vickers hardness, current efficiency, depositing rate and thickness were discussed. The results indicate that the microhardness, the depositing rate, the thickness of the nickel films gradually increase while the current efficiency decreases with the current density growing from 3 A/dm2 to 9 A/dm2. In the cases of 10 MPa, 323 K and 5 A/dm2, the microhardness, the current efficiency, the depositing rate and the thickness of nickel films are 7.01 GPa, 94.51%, 51.85 mg/cm2·h and 30.5 μm, respectively. Compared to the conventional electroforming method, the nickel film by SCF-CO2 electroforming has more flat surface and more dense microstructure.