Replaceable film filter core for PM2.5 purifying mouth mask and preparation method of filter core

The invention discloses a replaceable film filter core for a PM2.5 purifying mouth mask and a preparation method of the filter corer. The replaceable film filter core for the PM2.5 purifying mouth mask comprises a first spunbonded nonwoven fabric layer, a melt-blown nonwoven fabric layer, a PTFE (Polytetrafluoroethylene) microporous film layer, an activated carbon nonwoven fabric layer and a second spunbonded nonwoven fabric layer which are combined from top to bottom successively. The film filter core has the beneficial effects that the small aperture and high porosity of a polytetrafluoroethylene microporous film is utilized, and the polytetrafluoroethylene microporous film is compounded with other layers, through multi-layer filtration and adsorptive action, the object of preventing PM2.5 particles from entering a human body is effectively achieved. The film filter core is a thin sheet piece, is extremely light, long in useful service life, good in PM2.5 particle preventing effect, good in air permeability, and designed to be replaceable in use, saves resources, has characteristics conforming to environmental requirements, and is worthy of being produced and popularized.