The utility model relates to the technical field of continuous casting and provides a tundish. The tundish comprises a lining guard board and two slag dams, wherein the external contour of the lining guard board is U-shaped; the U-shaped outer wall is connected to a concave impact zone located on one side of a steel pouring channel; two grooves, which extend longitudinally, are correspondingly formed in the places, which are close to two ends, of the U-shaped inner side; first sides of the two slag dams are correspondingly clamped in the two grooves, and second sides of the two slag dams are resisted against the sidewall of the other side of the steel pouring channel; a deflector hole is formed in each slag dam. One side of each slag dam is directly connected to the lining guard board through the corresponding groove, and the other side of each slag dam is resisted against the sidewall of the steel pouring channel, so that the connection intensity of the slag dams is improved, and the slag dams are good in stability and difficult to fall down, and thus occurrence of a steel-making accident can be avoided.