Hafnium nitride (HfN), as one of the most stable of transition metal nitrides, has shown great application potential in many fields. In this paper, a series of Hf-B-N films doped with different B contents were prepared. The results show that when the doping amount of B is 6.56 at.%, the hardness of Hf-B-N film is 24% higher than that of undoped HfN film, which is 35.27 GPa. And the wear rate of the film is one order of magnitude lower than that of the undoped HfN film. Solid solution strengthening and the stress generated by the coherent interface are responsible for the enhancement of strength. When the content of B continues to increase, the fracture toughness of HfN film is nearly 6 times higher than that of binary HfN film, and the highest fracture toughness is 5.98 MPa m1/2. It is found that the amorphous BN phase and the nanocrystalline HfBN phase coexist, and the synergistic effect of the ductile nanocrystalline phase and the amorphous phase improves the fracture toughness and bonding strength of the films. The films with high boron content have excellent oxidation resistance and corrosion resistance.