The invention relates to the technical field of mechanical equipment, in particular to a welding machine for valve production. Through automatic welding of a valve, the welding strength of the valve can be effectively improved, the quality of the valve is improved, at the same time, the welding speed of the valve is increased, the work efficiency is effectively improved, and when the welding machine is in operation, a human body can be far away from the welding machine, so that the high temperature generated by a welding gun during welding is effectively prevented from causing scald to the human body, and the practicality and reliability are improved. The welding machine comprises a working table, a chuck bracket, a chuck, a spindle, a first belt pulley, a first motor, a second belt pulley, a belt, a casing, a second motor, a speed reducer, a first spiral gear and a lead screw, wherein the left side of the top end of the working table is connected with the bottom end of the chuck bracket, the chuck is located at the upper right of the chuck bracket, and the left end of the chuck is connected with the right end of the spindle.