The utility model provides an ultra-long part surface treatment workshop. Relating to the technical field of industrial processing, the ultra-long part surface treatment workshop comprises a wall body, workshop door is arranged on the wall body, a surface treatment system is arranged in the workshop; the surface treatment system comprises three treatment tanks arranged in parallel in the width direction and a lifting device capable of moving in the width direction. The direction of the workshop door is consistent with the length direction of the processing grooves, feeding and discharging stations are arranged on the outer sides of the processing grooves, the lifting device lifts parts at the feeding and discharging stations and moves in the width direction to enable the parts to pass through the processing grooves, and the lifting device is located above the processing grooves and provided with a vertically-telescopic suspension arm structure. When in use, parts enter the workshop along the orientation direction of the workshop door, are treated in the treatment tanks through the lifting devices, then leave the workshop along the length direction of the treatment tanks and do translational motion only in the width direction, so that the purpose of effectively utilizing the field of the surface treatment workshop is achieved.