The invention belongs to the technical field of welding technologies, and particularly relates to a titanium alloy welding area protecting tool and a welding method thereof. The titanium alloy weldingarea protecting tool comprises a protective shell, a hanging basket, a gas equalizing plate and a core block, wherein the hanging basket is arranged in the protective shell in a suspended mode, and the gas equalizing plate is arranged between the protective shell and the hanging basket; and the core block is arranged in the hanging basket, and the lower end of the core block is in threaded connection with the upper end of the gas equalizing plate. According to the titanium alloy welding area protecting tool, vacuumizing equipment is not needed, and the titanium alloy welding area protecting tool is more effective and simpler for the follow-up titanium sheet welding process evaluation work.