The invention relates to an automatic spraying system with a correcting function for workpiece processing. The system comprises a workbench, a supply mechanism, a correcting mechanism, a spraying mechanism, a conveying belt, a controller and four supporting legs; the supply mechanism comprises a fixed block, a supply pipe, a pushing assembly and two adjusting assemblies, wherein the pushing assembly comprises a driving unit, a reciprocating rod and a pushing block; and the correcting mechanism comprises a supporting block, a power assembly, two correcting assemblies and four supporting rods, wherein the power assembly comprises a moving plate, a correcting plate and two buffering units. According to the automatic spraying system with the correcting function for workpiece processing, workpieces are automatically placed on the conveying belt one by one through the supply mechanism, and operators do not need to manually place the workpieces, so that the working time of the workers is shortened, and the labor cost is reduced; and moreover, the position of the workpieces on the conveying belt can be corrected through the correcting mechanism, thus facilitating the accurate spraying of nozzles, ensuring the spraying quality, and improving the practicability of the system.