The invention provides a method for target material component welding. The method comprises the following steps that a tungsten target material, a back board and an aluminum middle layer are provided; the tungsten target material, the aluminum middle layer and the back board are placed in a vacuum bag, the aluminum middle layer is located between the tungsten target material and the back board, and the vacuum bag is arranged in a welding device; the hot isostatic pressure technology is used for welding the tungsten target material, the aluminum middle layer and the back board together to form a target material component; after welding is completed, the vacuum bag is cooled and removed, so that the target material component is obtained. Due to the fat that the aluminum middle layer is additionally arranged between the tungsten target material and the back board, and the hot isostatic pressure technology is used for welding the tungsten target material and the back board together, welding efficiency is improved, the formed target material component is good in welding binding rate, high in welding strength and small in deformation, large-area welding can be achieved, and therefore the requirements for long-term stable production and using of target materials can be met.