The invention provides an antibacterial mildew-proof textile and a method for preparing the antibacterial mildew-proof textile. Catalytic zinc oxide antibacterial liquid is contained in the antibacterial mildew-proof textile, the antibacterial mildew-proof textile refers to a natural textile, a synthetic textile or a mixture of the natural textile and the synthetic textile; and the main component of the antibacterial mildew-proof textile refers to catalytic zinc oxide with the average particle size of 23 nanometers. The preparation method comprises the following steps: preparing dispersion liquid, and dipping the textile in the diluent of the dispersion liquid, thereby obtaining the antibacterial mildew-proof textile. The antibacterial mildew-proof textile disclosed by the invention does not cause color change, is an antibacterial agent with the antibacterial rate of 99.99 percent, has excellent characteristics such as bacteria and mildew resistance, ultraviolet resistance, far infrared emission resistance, continuous release of negative ions and the like and can be applied to the wide fields such as beach umbrellas, medical and hygienic materials, outdoor sports wear, underwear, bedding articles and air filtration equipment. Moreover, the antibacterial mildew-proof textile has the advantages of powerful functions, high safety and the like.