The utility model relates to the technical field of poultry breeding and epidemic prevention equipment, in particular to an automatic device for beak breaking and vaccine injection. In the device, a conveying assembly is provided with a grabbing area; the mechanical claw assembly moves above the grabbing area and is used for grabbing the chicks in the grabbing area and conducting head direction adjustment, head contour image extraction, beak breaking and epidemic prevention operation on the grabbed chicks. The extending end of the mechanical arm assembly is movably connected with the mechanical claw assembly so as to drive the mechanical claw assembly to move. The control assembly is used for judging the position of the chick in the grabbing area, judging the beak breaking position according to the grabbed head contour image and beak contour image of the chick and sending control signals to the conveying assembly, the mechanical claw assembly and the mechanical arm assembly. The chickbeak breaking and vaccine spraying device can complete chick beak breaking and vaccine spraying in a full-automatic mode at a time, the risks of pecking injuries and epidemic situations in the chick growth process are reduced, and the survival rate is increased.