The invention discloses a preparation method of a Yinqiao powder bag. The preparation method comprises the steps of (1) getting the raw material components in parts by weight: 0.8 to 1.6 parts of flos lonicerae, 0.8 to 1.6 parts of fructus forsythiae, 0.5 to 0.9 part of herba menthae, 0.3 to 0.5 part of herba schizonepetae, 0.5 to 0.9 part of fructus arctii, 0.7 to 0.9 part of radix platycodonis, 0.5 to 0.8 part of fermented soybean, 0.5 to 0.9 part of rhizoma phragmitis, 0.3 to 0.6 part of herba lophatheri, and 0.5 to 0.8 part of radix glycyrrhizae; (2) smashing the fructus forsythiae, the fructus arctii, the fermented soybean and the radix glycyrrhizae, and sieving through a 65-mesh sieve; smashing the flos lonicerae, the herba menthae, the herba schizonepetae, the radix platycodonis, the rhizoma phragmitis and the herba lophatheri and sieving through a 24-mesh sieve; sterilizing; (3) putting medicine powder in a trough type mixing machine, adding water for stirring, mixing uniformly, and further preparing into soft and wet particles, wherein a pelletizing sieving screen is 12-mesh; putting the wet particles into a boiling dryer, drying until the moisture is smaller than or equal to 12 percent, and cooling; (4) granulating through an oscillating granulator, wherein the mesh number of a sieving screen is 10; feeding into a mixer for mixing, discharging, weighing and calculating weight; subpackaging into tea leaf bags. The Yinqiao powder bag prepared by the method provided by the invention is high in leaching efficiency, high in production efficiency, less in fine powder, easy to form, and good in taste.