The invention discloses mechanical tongs and a bale breaker comprising the tongs. The mechanical tongs comprise a bottom plate. The bottom plate is provided with a grabbing hook air cylinder and a lifting air cylinder, and the lifting air cylinder drives the bottom plate to move up and down. The grabbing hook air cylinder drives a rack to move up and down, the rack is engaged with two gears located on the two sides of the rack, and the two gears are opposite in rotation direction and the same in rotation angle. The two gears drive two rotation shafts to rotate, the two rotation shafts are provided with a plurality of sets of grabbing hooks, the multiple sets of grabbing hooks rotate along with the rotation shafts, and opening and closing of the pneumatic grabbing hooks are achieved. The bottom plate is provided with arc grooves matched with the grabbing hooks.