The invention discloses a conveying production line for laser cutting of tubular parts. The conveying production line comprises a fixing frame, a supporting frame, a storage hopper, grabbing devices, a transverse lead screw transmission mechanism, vertical lead screw transmission mechanisms, a work bin, a supporting table, hydraulic lifting cylinders, positioning columns and a positioning air cylinder. The fixing frame is located at the left side of the supporting table. The storage hopper is located at the upper end of the fixing frame. The positioning air cylinder is located at the front side of the storage hopper. The positioning cylinders are located at the upper ends of the hydraulic lifting cylinders. The supporting frame is located at the rear end of the supporting table. The transverse lead screw transmission mechanism is located at the upper end of the supporting frame. The vertical lead screw transmission mechanisms are located at the front end of the transverse lead screw transmission mechanism. The grabbing devices are located at the lower ends of the vertical lead screw transmission mechanisms. The conveying production line has the advantages of being reasonable in structural design, low in production and manufacturing cost and the like. The tubular parts can be automatically positioned and clamped; station motion is achieved for the tubular parts; the automation degree is high; positioning accuracy is high; the cutting speed of the tubular parts is increased; manpower and material resources are saved.