Production method of seamless steel tube

The invention discloses a seamless steel tube production method which comprises the following steps: conveying a tube blank to a walking beam furnace, heating the tube blank into a hot tube blank in the walking beam furnace, then conveying the hot tube blank to a sizing device, clamping and feeding the hot tube blank by the sizing device, and after the hot tube blank is fed in place, cutting off the hot tube blank; the hot-state pipe blank is clamped by the clamp device, the saw cutting device acts for cutting, the flame deburring device starts for deburring, the cut fixed-length pipe blank is conveyed to the head and tail centering device, and after centering holes are punched in the head and the tail, the cut fixed-length pipe blank is conveyed to a hot rolling production line; heat preservation structures are arranged on the two sides of a hot charging conveying roller way of the pipe blank hot charging and hot conveying device, the two sides of a before-saw-cutting conveying roller way of the before-saw-c