In view of the problems of chocolate 3D printer such as single printing color, difficult continuous extrusion and low printing accuracy, a new design of chocolate 3D printer is proposed. The new 3D printer of chocolate has more high precision, easily continuous supplying materials, and what’s more, printed in two colors. In the design, a screw push rod is employed as the feed part to extrude raw materials, which can realize that the storage box can continuously transfer raw materials to the feed box. Heating devices are installed on both the feed box and the nozzle part. The PID algorithm is used to control the temperature of the device, which is conducive to maintaining the stabilization of the melting temperature of chocolate. To serve the needs of two-color printing, the nozzle is designed into two extrusion holes in one head. Each hole can be controlled the condition of opening and closing independently. For a purpose of improving printing accuracy, the feed mechanism is fixed on the rack, and the nozzle is fixed on the motion mechanism, which is helpful to reduce the motion inertia and improve the printing accuracy.