The invention discloses a method for processing bottom cross beams or bottom side beams of a container, which processes the bottom cross beams and the bottom side beams in the same working area through a plurality of steps sequentially. The steps mainly include material loading, decoiling, pinch conveying, leveling, head cropping, end cropping and butt joint, waste collecting, guiding, pinch conveying, looping pit cushioning, deburring, roll forming, leveling, high-pressure blow drying and high temperature drying, ball blasting, electric static spraying, drying, leveling, numerically controlled specified length tracing shearing, conveying, and formed workpiece piling and blanking. The processing method has the advantages of high production efficiency, cost conservation and the like. The invention also discloses a production system for the processing method.