The invention relates to a nanometer fiber filter material. The nanometer fiber filter material is characterized by comprising a filter base material and a nanometer fiber layer formed on the filter base material, wherein the mass ratio of the filter base material to the nanometer fiber layer is 100:1-600:1. The nanoscale fiber material layer is composited on the surface of a traditional textile through an electrostatic spinning technology; the nanometer fiber fineness ranges from dozens of nanometers to hundreds of nanometers; fibers are cross-linked in an intricating mode; ultra-high magnitude-order nanoscale micro-holes exist, and the porosity is larger than 90%; the thickness of the fiber layer can be designed and machined according to the requirements of different products; PM2.5 and dust with the diameter larger than 2.5 microns can be totally filtered out, zero emission is achieved, different raw materials can be selected to machine the nanometer fiber layer according to the work condition and the characteristics of composited materials, and meanwhile the requirements for filtering precision, work condition temperature, chemical conditions and other aspects can be met. The running resistance of finished products is low, and filtering speed is high. The service life is long, the nanometer fiber filter material can be repeatedly used, and therefore running cost is greatly reduced, and higher cost performance is achieved.