The invention discloses a fuel injection device of biscuits, wherein an upper fuel injection mechanism comprises an upper shell, upper fuel injection nozzle assemblies and a middle stopper, the upper fuel injection nozzle assemblies are respectively arranged on the two sides of the inner wall of the upper shell, the middle stopper is fixed on the center of the upper shell, a fuel outlet end is arranged above a rotating disc, the rotating disc is of a disc shape which is low in middle portion and high in end portions, a fuel limit frame is fixed in the upper shell, and is of a closed shell, and openings are arranged on the bottom portion and the front surface of the fuel limit frame. The fuel injection device of biscuits is simple and practical, can achieve fuel injection of upper surfaces of the biscuits by utilizing high speed centrifugal oil mist, achieves fuel injection of lower surfaces of the biscuits by utilizing fuel injection components which are arranged on the lower portions, is simple in structure and convenient to use, and can achieve to make the biscuits with uniform quality.