Q-switched Nd∶glass laser with 30 ns pulse-width and 40 J energy is introduced to shock TC4 titanium alloy tungsten inert gas (TIG) welding joints once, twice and three times, separately. In order to study the influence of laser shock processing (LSP) disposal times on TC4 TIG welding joints microstructure and properties, surface HV hardness, microstructure, tensile property and scanning electron microscope (SEM) fracture photos of these joints are analyzed. Comparing with those joints without LSP treatment, surface HV hardness of weld beads treated by LSP is decreased. HV hardness on weld bead surface and that on the heat affected zone (HAZ) surface are hardly different. The amount of α′ phase near LSP treatment weld bead surface is reduced, and fine grains are increased in the HAZ. With the increase of LSP treatment times, HV hardness is improved on weld joints surface. Although LSP treatment joints tensile strength and yield strength are not distinctly change, specific elongation is shown fall trend along with LSP treatment times increased.