The work aims to investigate the effect of boron dopant on the corrosion resistance and friction and wear properties of diamond-like carbon (DLC) films in artificial seawater. An undoped DLC film and two boron-doped DLC films with the content of B element of 7.23% and 13.27% were deposited on the surface of 304 stainless steel substrate by unbalanced magnetron sputtering through controlling current of boron carbide and graphite targets. Scanning electron microscopy, Raman spectroscopy, nanoindentation tester, scratch tester and ball-on-disk tribometer were used to test the chemical composition, microstructure, nanohardness, adhesion and friction properties of films, respectively. The friction and corrosion resistance of films in artificial seawater medium was studied by testing the static polarization and electrochemical impedance spectroscopy and measuring the changes in open circuit potential of films before, during and after sliding process. Compared to undoped DLC film, there was less change in hardness and elastic modulus of boron-doped DLC film with B content of 7.23%. However, ID/IG ratio of doped DLC film increased, adhesion with substrate increased from 20 N to 36 N, corrosion potential increased, corrosion current density decreased, polarization resistance increased and tribocorrosion properties in the artificial seawater medium deceased by 10.7%, wear reduced by 37.0% and potential of open circuit increased dramatically. The tribocorrosion properties and corrosion resistance of DLC film with doped boron content of 13.27% decreased significantly. Doping appropriate amount of B into DLC film is helpful to improve the corrosion resistance and abrasion resistance of DLC film in artificial seawater medium.