The invention discloses a preparation method of nano porcelain-like sand grains. The nano porcelain-like sand grains are prepared from light calcium powder, plant cellulose, negative ion powder, edible gum, food colouring, dicalcium silicate, tricalcium aluminate and pearl powder in proportion. According to the preparation method of nano porcelain-like sand grains provided by the invention, pure natural inorganic powder and plant extract are polymerized and then fired to obtain the product, SGS detection indicates that the nano porcelain-like sand grains have no pollution or radioactivity, donot contain formaldehyde or other harmful substances, the grains are uniform, smooth, clean and free of fine sand, are healthy, environment-friendly, high strength, flame retardant, safe and environment-friendly sand grains, also carry negative ions in themselves, can effectively inhibit the breeding of bacteria, have the advantages of washability, great color variety, flame retardance, smooth surface, high hardness, health and environmental protection, sterilization function in themselves, provide children with a safer, healthier, more environmentally friendly, and also recyclable entertainment environment, and bring better application prospects.