The invention provides an automatic feeding device for a food production line. The automatic feeding device for the food production line comprises a conveyor line, material boxes and a hopper. Food grooves are machined in the upper portions of the material boxes in an array mode. A synchronous belt is wound on the exterior of the conveyor line. The material boxes are assembled on the synchronous belt. The hopper is assembled above the material boxes. The lower portion of the hopper is provided with parallel discharging outlets which directly face one transverse row of the array of the food grooves of each material box. Spherical food balls are assembled inside the hopper. The upper portion of each material box is flush. The distance between the discharging outlets in the lower portion of the hopper and the upper plane of each material box is smaller than the diameter of the food balls. The adjacent material boxes are tightly attached each other front and back and assembled on the conveyor line. According to the automatic feeding device for the food production line, the structure is simple, using is convenient, and spherical food can be made to directly roll down into the food grooves of the material boxes; the feeding process is completed automatically, the feeding effect is good, and the material leakage phenomenon is avoided.