This leg flexible welding production line integrates intelligent assembly system and intelligent storage system. Three-dimensional conveyor and intelligent welding assembly line, including system intelligent production and logistics distribution, robot automatic assembly, flexible storage and scheduling of multi-specification products, automatic code identification product call welding procedures, grinding and finished products, real-time recording of warehousing and so on. It solves the scheduling bottleneck when using RGV, does not need the cache area, moves the material inside the library, and does not occupy the beat time. To achieve the same production capacity, the number of robots used is small, and can be perfectly adapted to quality tracking management. The balance of the entire production cycle is achieved, the production efficiency is greatly improved, the product quality is improved, and the production cost is reduced.