The Maxwell 3D module in Ansys Electromagnetics Suite was used to establish a mathematical and physical model for electromagnetic field in the vacuum arc remelting process of titanium alloy, and the interaction law of current, magnetic field and electromagnetic force in the melting process was analyzed. The results show that the current in the ingot is centripetal and concentrated within 350 mm of the upper part of the ingot. Tangential magnetic field is generated by smelting current and axial magnetic field is generated by stirring current, which are simply coupled. Under the action of smelting current and its self-induced magnetic field, radial and axial electromagnetic forces are generated; the electromagnetic force rotates under the action of the stirring magnetic field, generating tangential electromagnetic force. With the change of smelting current, the tangential component of magnetic field and the radial and axial resultant force of electromagnetic force change linearly. The axial component of the magnetic field and the radial component of the electromagnetic force change linearly with the stirring current.