The utility model relates to a hammer, in particular to an oversize-knocking-face whole forging claw bending hammer. The existing hammer is generally insufficient in knocking accuracy due to the fact that the size of a knocking face is limited; a user is required to concentrate to accomplish accurate knocking; the gravity center of the existing hammer is insufficiently concentrated on the front end of the hammer; the knocking does not save labor; and the user can easily generate operation fatigue in an operation process. In order to improve the use efficiency of the existing hammer, the utility model aims at providing the hammer. The gravity center of the hammer is kept at the head of the hammer by increasing the knocking face and optimizing a structure, so that compared with the common hammer in the same specification, the hammer has the characteristics of high knocking accuracy, concentrated knocking strength, high efficiency and long service life.