WILA accurately clamps the titanium alloy valve stem, and the end thimble is locked; the additive repair of the laser coaxial powder feeding is used to repair the damaged area leaving a processing allowance. The scanning path is spiral forward, and the starting point position alternates between the left and right end and the difference is smooth. The hour hand rotates to control the temperature rise of the workpiece; fluorescence detection is adopted, and the size is restored by machining according to the requirements of the drawing and delivered and used.