The invention discloses a submersed nozzle for slab continuous casting. The submersed nozzle slab comprises a submersed nozzle main body having a submersed nozzle inner cavity with a sealed structured tail end, a zigzag structure arranged on the inner wall of the inner cavity of the submersed nozzle, a side hole formed in the side wall of the tail end of the inner cavity of the submersed nozzle to discharge steel liquid in the submersed nozzle. In the technical scheme, with the submersed nozzle inner wall in the zigzag structure, the steel liquid flows into the submersed nozzle and then shocks the zigzag structure; the steel liquid produces an eddy n the boundary layer of the submersed nozzle wall, so the steel liquid flows can be evenly mixed in the submersed nozzle and impurities in the steel liquid can be prevented from blocking the nozzle while accumulation; a technical problem of molten steel bias flow in the crystallizer due to the inner wall of the submersed nozzle blocked by the impurities can be solved; and bias flow of the steel liquid after the molten steel enters the crystallizer.