The invention discloses a shampoo for relieving postpartum hair loss, and a preparation method thereof, and belongs to the field of daily wash supplies. The shampoo is prepared from, by mass, 10-20% of sodium laureth sulfate, 2-8% of cocamidopropyl betaine, 1-2% of polyquaternium-7, 1-2% of ethylene glycol distearate, 8-10% of lemon seed extract, 6-8% of fulvic acid, 2-6% of Gentiana scabra Bungeextract, 4-8% of Procumbent Tridax extract, 1-3% of linseed extract, 0.1-0.5% of kathon, and the balance of deionized water. The shampoo is mild, has small irritation, and can prevent inflammations, inhibit bacteria, relieve itches, enhance the immunity, grow hair and care hair while relieving the postpartum hair loss in order to greatly reduce women's troubles brought by postpartum hair loss; andthe shampoo has a reasonable ratio, is safe and reliable, and has a better postpartum hair loss relief effect than common commercial shampoos.