The utility model relates to a submersed nozzle for sheet billet continuous casting. One end of the submersed nozzle is provided with a first expansion section and a second expansion section which are used for molten steel to flow in a bowl mouth in the shape of a straight pipe, and are communicated with the lower part of the bowl mouth. The two sides of the first and the second expansion sections extend outwardly in flat shapes. The lower part of the second expansion section is symmetrically provided with two circular horizontal outlets having the same cross section from inside to outside, and the bottom center of the second expansion section is provided with a shunting body for reducing flow speed of molten steel. The submersed nozzle is advantageous in that with the adoption of the shunting body with a slow slope, the inclined flow outlet, and the horizontal outlets having the same cross section from inside to outside, the molten steel whose flow speed is reduced can stably flow in a metal crystallizer; turbulent flow can be prevented and the inflow of casting powder can be blocked; the structure of the submersed nozzle is simple and the producing is convenient.