The invention discloses ultra-high-count pure cotton 
combing yarn and a 
spinning technology of the ultra-high-count pure cotton 
combing yarn. Raw cotton comprises, by weight, 15%-25% of Egypt cotton, 25%-35% of American cotton and 40%-50% of Xinjiang long stapled cotton, wherein the Egypt cotton, the American cotton and the Xinjiang long stapled cotton are blended to spin 200S to 300S pure cotton 
yarn. The 
spinning technology includes the following steps that the first procedure of blowing-
carding, the second procedure of 
combing, the third procedure of drawing, the fourth procedure of roving yarn, the fifth procedure of spun yarn and the sixth procedure of 
spooling. With the blending scheme, the raw cotton can integrate the advantages of high 
fineness and good maturity of the Egypt cotton, the advantages of high strength and non-existing abnormal fibers of the American cotton, the 
advantage of large length of the Xinjiang long stapled cotton and the like. The raw cotton reaches the requirements for the 
fiber length, the length CV value, the Micronaire value, the 
fineness, the strength and other performance indexes of raw cotton in producing ultra-high-count yarn. According to the 
spinning technology of the ultra-high-count pure cotton combing yarn, the ultra-high-count yarn can be produced under a large ration of roving yarn, the spinning efficiency is improved and meanwhile, quality of 
resultant yarn is ensured.