A crystallizer for continuous casting, comprising: a graphite sleeve provided with a plurality of drawing holes, and a cooling jacket (2, 3,6) provided inside with a coolant cavity; wherein the graphite sleeve is of a plate shape and has two plate faces; the drawing holes penetrate through the two plate faces along a length direction or a width direction of the graphite sleeve; and the cooling jacket (2, 3, 6) is of a plate shape and provided at least in two, the two plate faces being both attached to the cooling jacket (2, 3, 6) so as to cool the graphite sleeve, wherein the cooling jacket comprises a first cooling jacket, the first cooling jacket including a cover plate and a base; the base comprises a base plate, a first side plate parallel to a length direction of the drawing holes and a second side plate vertical to the length direction of the drawing holes; the cover plate, the base plate, the first side plate, and the second side plate enclose to form the coolant cavity; the cover plate is provided thereon with a first liquid inlet hole; and the first side plate is provided thereon with a first liquid outlet hole, characterized in that the graphite sleeve is provided with a plurality of drawing holes, and wherein the cooling jacket comprises a second cooling jacket; the crystallizer for continuous casting comprises a graphite sleeve, a first cooling plate, and a second cooling jacket, wherein two or more graphite sleeves are provided; the second cooling jacket is attached between two neighboring graphite sleeves; two first cooling jackets are provided, the graphite sleeves and the second cooling jacket being provided between the two first cooling jackets. a graphite sleeve provided with a plurality of drawing holes, and a cooling jacket (2, 3,6) provided inside with a coolant cavity; wherein the graphite sleeve is of a plate shape and has two plate faces; the drawing holes penetrate through the two plate faces along a length direction or a width direction of the graphite sleeve; and the cooling jacket (2, 3, 6) is of a plate shape and provided at least in two, the two plate faces being both attached to the cooling jacket (2, 3, 6) so as to cool the graphite sleeve, wherein the cooling jacket comprises a first cooling jacket, the first cooling jacket including a cover plate and a base; the base comprises a base plate, a first side plate parallel to a length direction of the drawing holes and a second side plate vertical to the length direction of the drawing holes; the cover plate, the base plate, the first side plate, and the second side plate enclose to form the coolant cavity; the cover plate is provided thereon with a first liquid inlet hole; and the first side plate is provided thereon with a first liquid outlet hole, characterized in that the graphite sleeve is provided with a plurality of drawing holes, and wherein the cooling jacket comprises a second cooling jacket; the crystallizer for continuous casting comprises a graphite sleeve, a first cooling plate, and a second cooling jacket, wherein two or more graphite sleeves are provided; the second cooling jacket is attached between two neighboring graphite sleeves; two first cooling jackets are provided, the graphite sleeves and the second cooling jacket being provided between the two first cooling jackets.