The invention relates to a rotating horizontal hammering device. The rotating horizontal hammering device solves the problems an existing automatic hammering device is usually used for carrying out hammering in the vertical direction, and a device capable of being used for horizontal hammering is insufficient in strength. The rotating horizontal hammering device comprises a rack. A horizontal rotating shaft driven through a power machine is arranged on the rack. The horizontal rotating shaft is provided with a short hammer handle. The outer end of the short hammer handle is hinged to a long hammer handle. A hammer head is fixed to the outer end of the long hammer handle. A pin shaft sleeve which is arranged at the end of a pin shaft to be hammered is arranged at the position, located on a hammer head moving track line, below the rotating shaft. The pin shaft sleeve is erected on the rack in a sliding mode. A buffer spring is further arranged between the end of the pin shaft sleeve and the rack. According to the rotating horizontal hammering device, rotational motion is adopted, the potential energy of the hammer head is converted into horizontal hammering force, and a strong horizontal hammering action is carried out.