A production method of a fiber coated quartz capillary preformed rod comprises the following steps: preparing highly pure quartz sands with the SiO2 content being less than 99.9998%, and carrying out melt drawing forming through a continuous melting furnace. A special former adopts a middle portion cylinder segment and lower portion frustum segment combination design, a micro-porous forming core arranged in a gas flow through hole is arranged at the bottom end of the former, the micro-porous former is provided with 7-9 micro-pores, the inner pore diameter of the drawing formed quartz capillary preformed rod is 0.125-0.127 mm, the external diameter deviation of a quartz coated tube is 0.02 mm, the thickness deviation is 0.015 mm, and the hydroxyl value after dehydroxylation treatment is not more than 1 ppm. Rich natural crystal raw materials in China are utilized, fiber coated tube nationalization is realized, and the high-quality and high-purity porous quartz coated tube for the fiber is manufactured through using the method, and completely reaches the quality standards of national products of the same kind.