The invention discloses weld joint machining equipment with movable polishing and anticorrosion paint spraying functions for steel plate welding. The weld joint machining equipment comprises a mounting plate and a bracket, the bracket is arranged on the upper wall surface of the mounting plate, a movable placing unit is mounted on the lower part of the bracket, and a polishing and paint spraying unit is mounted on the lower part of the bracket. The weld joint machining equipment has the beneficial effects that the weld joint treatment procedure can be completed rapidly and effectively, throughthe automatic design, the problems that weld joint treatment work of a steel plate is mostly manually operated, the automation degree is low, workers are likely to feel fatigue after working for a long time, it is unfavorable to physical health, safety accidents and working accidents are prone to occurring, and consequently, the unnecessary economic loss is caused are solved effectively, the steel plate is automatically placed, polishing and paint spraying are integrated, thus the labor capacity of the workers is decreased greatly, the working efficiency is improved, and using is convenient.