Method for preparing cotton fiber filter material

The invention belongs to preparation of a filter material, in particular to a preparation method of a cotton fiber filter material, comprising the following steps: cotton staple which has the length of 2-15mm and the cotton content of above 90% is gradually changed into complete filament by adopting a triple opening and twice volume method for balancing uniformity finishing and a twice quantitative cotton feeding method, and then the complete filament is prepared into the cotton fiber filter material by the processes of air laid, glue spraying, drying and scrap edge lapping. The invention solves the deficiency that short and fine fiber is difficult to be used by a non-woven filter material in the prior art, and can use the short and fine fiber generally regarded as waste fiber in industryas a production raw material so as to protect environment, save materials and have low production cost, and the product performance can meet international standards, thus filling a gap of domestic air purification materials a