The utility model relates to a continuous slab casting mold, which belongs to the field of the metallurgic continuous steel casting equipment. The continuous slab casting mold is formed by assembling two opposite wide copper plates (6) and two opposite narrow copper plates (1). The continuous slab casting mold is characterized in that the transition from the inner surfaces of the narrow copper plates (1) to the inner surfaces of the wide copper plates (6) adopts a circular curve surface (3), the two ends of the narrow copper plates (1) are respectively provided with a platform (4), the platforms (4) of the narrow copper plates and the wide copper plates (6) form 90-degree included angles, the radius of chamfers in the connection positions of the circular curve surface (3) and the planes (2) and the platforms (4) of the narrow copper plates is 2-6mm, and the included angle alpha between the axial line of a cooling water seam (5) on the back face of the circular curve surface (3) and horizontal plane is 50-80 degrees. The utility model can reduce horizontal cracks on the corners of the surface of the continuously cast slab, cracks on the edge of the hot-rolled steel plate and vertical 'black lines' on the hot rolled coil, thereby improving the yield of steel plates.