The invention relates to a method for producing glass fibers by using glass fiber waste silks, which comprises the following steps of: S11, washing glass fiber waste silks; step S12, pulverizing the washed glass fiber waste silks, and controlling particle sizes of the pulverized glass fiber waste silks to 20 meshes to 325 meshes; step S13, dehydrating the pulverized glass fiber waste silks to result in below 1.5% of water in percentage by weight in the glass fiber waste silks; and step S14, uniformly mixing the dehydrated glass fiber waste silks with general glass fiber material powders, and placing the mixture in a glass fiber tank furnace for producing the glass fibers. The glass fiber waste silks can be uniformly mixed with the powder materials by controlling ground particle size, water content and ratio of the glass fiber waste silks to the powder materials, so that the defects on white spots and bubbles in the prior art are overcome, quality of the glass solution is improved, energy consumption in producing the glass solution is reduced, proportion of using the waste silks is increased, quality of the glass fibers is ensured and the phenomenon of prolonging raw material line of melting part will not be caused.