The invention discloses a preparation method of a chocolate bonbon suitable for 3D printing. The chocolate bonbon is mainly composed of a chocolate core and a candy shell. According to the manufacturing method, a chocolate core is printed through 3D printing; then a candy shell is printed on the chocolate core; the chocolate core comprises the following raw materials in parts by weight: 50 to 100 parts of coco powder, 30 to 40 parts of lecithin of black soya bean, 20 to 40 parts of milk powder, 0.5 to 2 parts of flexibilizer, 0.5 to 2 parts of plasticizer, 0.5 to 2 parts of lubricant, 0.5 to 2 parts of co-solvent, 0.6 to 1.5 parts of leveling agent, 0.6 to 1.5 parts of dispersant, 0.6 to 1.5 parts of compatilizer, 0.6 to 1.5 parts of emulsifier, 0.6 to 1.5 parts of stabilizing agent, 0.2 to 1.2 parts of antioxidant, 0.2 to 1.2 parts of coagulant aid, 0.2 to 1.2 parts of antibacterial agent, 0.2 to 1.2 parts of flavor enhancer, 0.2 to 1.2 parts of fragrance agent, and 4 to 5 parts of sweetener. The provided preparation method can increase the temperature rising speed during the printing process, the model melting temperature, and three-dimensional moulding rate. The chocolate bonbon has stable fluidity, certain viscosity, stable moulding temperature, and good heatproof performance. The hole will not be obstructed during the printing process. Through the 3D printing technology, the original characteristics and taste of chocolate are preserved, and the shape of the chocolate bonbon is novel and beautiful.