The invention discloses a salt bath niobium seepage agent for seepage catalyzing for metal titanium surface Fe powder and a niobium seepage method. The salt bath niobium seepage agent for seepage catalyzing for the metal titanium surface Fe powder is characterized in that the niobium seepage agent is composed of Na2B4O7, Nb2O5, SiC and Fe powder, and after being evenly mixed, the components are placed in an oven at the temperature ranging from 100 DEG C to 120 DEG C, and the needed salt bath niobium seepage agent can be obtained through drying for 40 min-60 min to be used later. The niobium seepage method comprises the steps of titanium alloy surface treatment, niobium seepage agent heating and salt bath heat preservation niobium seepage. According to the salt bath niobium seepage agent and the niobium seepage method, the seepage speed is high, a seepage layer is thick, the workpiece surface quality is good, the operation technology is simple, and the economic performance is excellent; and the salt bath niobium seepage agent and the niobium seepage method can be used for industrial production and have very wide application prospects in the biomedical field and other fields.