The invention discloses a preparation method of an electrostatic spinning PAN/bamboo charcoal powder nanofiber membrane filtering material and a product of the preparation method. The method comprisesthe following steps: preparation of a polyacrylonitrile solution; preparation of a polyacrylonitrile bamboo charcoal solution; electrostatic spinning; preparation of a nanofiber membrane filtering material: preparing a filtering material comprising a multilayer structure of polypropylene nonwoven fabric, a polyacrylonitrile nanofiber membrane, a polyacrylonitrile nanofiber membrane containing bamboo charcoal, a polyacrylonitrile nanofiber membrane and polypropylene nonwoven fabric. The nanofiber membrane filtering material is small in fineness, and has the characteristics of low resistance, high flow, low penetrating power and high filtering efficiency, and meets the performances of the currently pursuant filtering materials.