The utility model discloses a feeding device for a loading machine head. Wherein the frame is installed on a sliding rail of a loading machine head, the bottom plate mechanism is arranged in the frameand can be opened, the bag rotating mechanism is installed above the frame, when the bottom plate mechanism is opened, bagged objects placed on the bottom plate mechanism can fall off, and the bag rotating mechanism is used for changing the placement angle of the bagged objects on the bottom plate mechanism. The placing posture of bagged objects can be changed according to needs, and the cement bag stacking capacity of the automatic truck loading machine head and the adaptability of the stacking environment are enhanced.