The automatic fiber feeding machine is suitable for the automatic transmission and feeding equipment of ultra-short fibers.Short fibers with the length of 3-12mm such as compacted chemical fibers,wood pulp fibers,natural fibers and so on can be opened and scattered by an automatic feeding machine and uniformly conveyed into a quantitative machine. The machine is controlled in conjunction with the fiber quantifier,variable frequency or servo quantification,which saves manpower and most importantly,achieve continuous and uniform delivering,so that the host's cotton is more uniform.