The invention provides a novel hair washing / caring / nourishing composition. The novel hair washing / caring / nourishing composition is composed of three parts, namely a liquid shampoo, a hair conditioner and a hair nourishing essence, wherein the liquid shampoo is prepared from 20-60% of glycerol, 1-5% of lauramide MEA, 15-25% of lauroyl glutamate, 0.2-1% of guar gum hydroxypropyl trimethyl ammonium chloride, 0.3-1% of essence and 20-50% of water; the hair conditioner is prepared from 30-70% of glycerol, 3-8% of octadecanol, 0.5-2% of guar gum hydroxypropyl trimethyl ammonium chloride, 1-3% of behentrimonium chloride and 20-60% of water; the hair nourishing essence is prepared from 30-85% of jojoba oil, 3-25% of squalane, 5-40% of caprylin / capric glycerate, 0.5-5% of egg oil, 1-10% of curcuma oil, and 1-10% of camellia oil. According to the novel hair washing / caring / nourishing composition, the three parts, namely the liquid shampoo, the hair conditioner and the hair nourishing essence, are matched with each other to achieve a synergic effect; the composition has the characteristics of mild and non-irritating properties, rich foam, high compatibility, hair nourishing and caring, no preservative and the like.