The invention provides a ginger extract fiber and a preparation method thereof. Extracts of green tea, gallnut, mint, sarcandra glabra and ginger are added into a cellulose dissolving solution, then a binding agent is added, the prepared fiber has the dry breaking strength of 3.51-4.08 cN / dtex and the wet breaking strength of 2.02-2.64 cN / dtex, the fiber has high mechanical performance, meanwhile, fibrillation of the fiber is improved, and the fibrillation grade is 1. The surface of the fiber is smooth and flat and is superior to that of common tencel fiber in the market, the service life of the fiber is prolonged, the practicability of the tencel fiber is enhanced, the tencel fiber is not prone to pilling after being rubbed, and the quality of yarn and fabric is effectively improved in the spinning process; and by adding the plant extracts, the fiber has a natural antibacterial effect, the antibacterial rate to staphylococcus aureus is greater than 99%, the antibacterial rate to klebsiella pneumoniae is greater than 99%, the antibacterial rate to candida albicans is greater than 98%, the antibacterial effect is lasting, and the antibacterial loss rate is lower than 2% after the fiber is washed 100 times.