The invention discloses an automatic welder of wheel buckle type scaffold vertical rods. The welder comprises a bracket and a control cabinet, wherein the bracket comprise a bracket upper part and a bracket lower part; the welder is characterized in that an electric bracket assembly, a pneumatic clamping assembly and a steel tube bracket assembly are arranged at the bracket lower part; a pneumatic cylinder, a welding gun adjusting mechanism, a solenoid valve, a welding gun, a wire feeder, a wire reel, a ball screw, a stepping motor, a linear guide rail and a drag chain are arranged at the bracket upper part; the solenoid valve is connected with the pneumatic cylinder through the drag chain; the solenoid valve controls the welding gun to move longitudinally; the stepping motor is connected with the ball screw; the ball screw is connected with the welding gun; the welding gun moves laterally on the linear guide rail through the ball screw; the welding gun adjusting mechanism adjusts the angle of the welding gun. The welder can completely replace manual welding, controls the rotation of steel tubes through a rotating motor, reduces the labor intensity, controls the longitudinal, lateral and angle motions of two welding guns through the control cabinet, and has the advantages of high welding precision, high efficiency, low fault rate and low cost.