Automatic large steel spraying process and production line

An embodiment of the invention discloses an automatic large steel spraying production line, and particularly relates to the field of steel spraying processes. By adopting a stepping type manual supplementing mode, manual spraying personnel can conveniently observe and spray the difficult-to-spray angle position of a workpiece at a zero distance close to the workpiece, and the manual spraying operation position environment is more comfortable; for the design of the manual supplementing spraying position, a mode of combining manual pre-supplementing, automatic spraying and manual repairing spraying is adopted, so that the spraying effect of the concave part of the steel can be effectively improved, omission during spraying is avoided, the production period of the steel is shortened, and the working efficiency is improved; and during color changing, all powder pumps are lifted from a powder box, the powder box is removed from a vibration table, powder on the inner wall of a powder path on an air blowing valve of