The invention discloses a modularization arc welding station which comprises a first integration module and a second integration module supported on the working ground and detachably connected with the working ground, wherein the first integration module is used for integrating a welding robot for welding, a positioner for transforming the welding angle, and a welding clamp into an internal cavity; the welding clamp is mounted on the positioner and is used for clamping a to-be-welded assembly; the second integration module is detachably connected with the first integration module, communicateswith the internal cavity of the first integration module, and is used for providing a piece feeding space; an operator clamps the to-be-welded assembly on the piece feeding space on the welding clamp; the first integration module, the second integration module and the working ground define a sealed welding operating space; the modularization arc welding station further comprises a third integration module detachably connected with the first integration module; and the third integration module is used for controlling action of the welding robot, the positioner and the welding clamp. The modularization arc welding station is convenient to move, dismantle and operate and short in upgrading period.