Through utilizing numerical simulation methods, the flow state of the melt pool during the vacuum self-consumption melting process of titanium alloy was analyzed. The influence of the stable arc cycle on the shape of the melt pool, dendrite spacing, surface quality, and shrinkage cavity was examined. The results showed that without an external magnetic field, the melt pool for smelting a Φ720 mm specification titanium alloy ingot is dominated by self-inductive magnetic force, leading to a downward flow in the central part of the melt. A mere 0.5G stray magnetic field can result in Ekman suction, causing an upward secondary flow in the core to counteract it. At an externally added magnetic field strength of 50G, choosing a 10s-20s cycle can achieve a relatively stable double-ring flow pattern. The shape of its melt pool, dendrite spacing, and contact ratio all reach optimal performance, thus verifying the possibility and feasibility of the double-ring flow, and the macroscopic segregation of the simulated ingots essentially matches the experimental results, aiming to provide references for selecting parameters in actual production.