The invention discloses a narrow-face copper plate for a chamfer crystallizer. A working face of the narrow-face copper plate for the chamfer crystallizer comprises a first part and a second part; the first part is a sunken curved surface; the first part is a part on the working face in a range of 200mm to 400mm apart from an upper port of the crystallizer. The first part comprises a first curved surface region, two second curved surface regions and two transition curved surface regions, wherein the first curved surface region is a second degree parabola region; the two second curved surface regions are curved surfaces of which the crown heights are 1mm to 3mm; the two transition curved surface regions are curved surfaces with radii of 5mm to 35mm; the two transition curved surface regions are respectively connected with two opposite sides of the first curved surface region and the two second curved surface regions. The second part is connected with the first curved surface region, the two second curved surface regions and the two transition curved surface regions; the second part is a linear conical surface. The narrow-face copper plate for the chamfer crystallizer is also provided with a cooling waterway for cooling the working face; the distance between the cooling waterway and the edge, which is far away from the transition curved surface regions, on each second curved surface region is 20mm to 40mm; the distance between the cooling waterway and each transition curved surface region is 10mm to 30mm.