The invention relates to the technical field of shipbuilding, and particularly discloses an angular deformation correction device and correction method. The angular deformation correction device comprises a first tool, a second tool and a jacking mechanism, the first tool comprises a first limiting plate, the second tool and the first limiting plate are arranged in a spaced mode, the second tool can move relative to the first limiting plate, and the jacking mechanism can adjust the spacing between the first limiting plate and the second tool. According to the angular deformation correction device and correction method, the second tool and the first limiting plate are arranged in a spaced mode, a free edge of a to-be-welded workpiece can be arranged between the second tool and the first limiting plate, after the welded free edge of the workpiece generates angular deformation, the jacking mechanism can control and adjust the spacing between the second tool and the first limiting plate, and then the angular deformation quantity of the free edge of the workpiece can be effectively corrected. The angular deformation correction device is simple in structure and convenient to correct, thecondition that fire work operation is adopted and diagonal bracings are additionally arranged can be avoided, the correction cost is reduced, and the efficiency and the quality are improved.