The invention discloses printing ink. The printing ink is prepared from the following raw materials in parts by weight: 30-40 parts of carbon black, 20-30 parts of polyamide-modified phenolic resin, 20-30 parts of lignin-modified phenolic resin, 15-20 parts of saturated polyester resin, 35-40 parts of isoamyl acetate, 4-5 parts of starch phosphate, 20-25 parts of ethanol, 10-15 parts of dimethoxy dipropylene glycol, 2-3 parts of energy stone, 2-3 parts of magnet, 4-6 parts of hydrotalcite, 1-1.2 parts of nonyl phenol polyoxyethylene, 1-1.5 parts of polysorbate, 1-2 parts of butyraldehyde oxime, 1-2 parts of calciumoctoate and 60-65 parts of water. The invention further provides a preparation method of the printing ink. The prepared ink has the advantages of high drying speed, great adhesive force and superior heat resistance.