The invention relates to a continuous production method and device for purified-cotton bleached non-woven fabrics. The method includes the following steps of raw cotton opening, carding, cross lapping, prewetting compaction, drafting, positive and negative spunlace, high-efficiency squeezing, boiling and bleaching liquid padding, a steaming reaction, high-efficiency rinsing, PH adjustment, softening, roller drying, multi-layer loose drying and finished-product packaging. The method and the device have the advantages of saving energy, reducing labor intensity of workers, shortening production time, improving production environment, improving product quality, reducing discharge of sewage and pollution of waste gas to the environment, improving utilization of land, workshop buildings and equipment, and reducing investment of factories, and are beneficial to currently-advocated energy conservation, emission reduction, clean production and intelligentized factory construction.