The utility model relates to a mechanism for scattering granular foodstuffs on the surfaces of cakes. The mechanism consists of a cake blank conveyer belt, a granular foodstuff storage hopper, a granular foodstuff distributor, a motor and a granular foodstuff reception hopper, wherein the granular foodstuff distributor consists of a double-screw rod conveyer which is arranged at the bottom of the granular foodstuff storage hopper, a motor which is used for driving the double-screw rod conveyer to run and a transmission part; rotation directions of two screw rods of the double-screw rod conveyer are opposite; a locally closed or fully closed spacing is arranged between the two screw rods; end parts of the two screw rods are connected with feedback bins; and a long and narrow discharging port which extends along the axial direction is arranged on the double-screw rod conveyer, opposite to a cake blank. According to the utility model, through adoption of the double-screw rod conveyer in which the rotation directions of the two screw rods are opposite, a round-trip conveying loop is formed; and the feedback bins are arranged at the end parts of the two screw rods, the long and narrow discharging port is arranged on the conveyer along the axial direction and an adjustment gate is additionally arranged on the discharging port, so that the mechanism has the characteristics of uniform and smooth scattering of granular foodstuffs, wide scattering amount adjustment and control range, high precision, simple structure, reliability in running, less material consumption andclean environment and is suitable for line production.