The utility model relates to a hammer, and particularly relates to an integral hammering bent claw type hammer for increasing a striking face. The conventional hammer is not enough in striking precision when the size of the striking face is limited, so that a user needs to concentrate to accurately strike; and the gravity center of the conventional hammer is not concentrated enough at the front end of the hammer head and labor is wasted in a striking process, so that the user easily generates operation fatigue in an operation process. For improving the using efficiency of the conventional hammer, the utility model aims to provide the hammer; the gravity is kept at the head of the hammer through an optimal structure by increasing the striking face; and compared with the ordinary hammer with the same specification, the hammer has the characteristics of high striking precision, concentrated striking force, high efficiency and long service life.