The invention discloses a watermelon flavor pure-natural shampoo. The watermelon flavor pure-natural shampoo is prepared from the following raw materials in parts by weight: 15-20 parts of smoked plum, 5-10 parts of radix polygoni multiflori, 10-20 parts of aloe oil, 30-50 parts of sesame leaf, 8-12 parts of olive oil, 12-18 parts of higher aliphatic acid, 15-30 parts of aloe extraction solution, 2-4 parts of preservative, 12-18 parts of glycerol, 2-6 parts of watermelon element, 12-15 parts of edible white vinegar, 20-50 parts of beer, 15-50 parts of semen sesami nigrum, and the balance of water. The watermelon flavor pure-natural shampoo disclosed by the invention has the advantages of being simple in process, moderate in detergency, easy to rinse, and free from stimulation on hair, a skin and eyes; the washed hair is bright, soft, high in resiliency, and good in dry and wet combability, especially, the user can feel cool, refreshing, and relax; and the shampoo has the itch relieving effect, is capable of preventing or inhibiting scurf from regenerating, refreshing and restoring consciousness, soothing the nerves and nourishing heart.