The invention relates to a producing method of a piezoelectric electret film, and the producing method is as follows: fluorinated ethylene propylene copolymer films and polytetrafluoroethylene films are alternately laminated together, and then placed on a substrate, after the alternate lamination, two outermost layers are the polytetrafluoroethylene films; a latticed pressing plate is arranged on an outermost layer t polytetrafluoroethylene film opposite the substrate, pressure is applied to the pressing plate, the alternately laminated structure of the fluorinated ethylene propylene copolymer films and the polytetrafluoroethylene films is heated, after cooling, the pressing plate and the substrate are removed to obtain the piezoelectric electret film provided with micropores in the middle. In the production process of the piezoelectric electret film, through selection of latticed pressing plates with different specifications, such as regulation of mesh net opening mesh number, wire diameter, shape and other parameters and thermal bonding process parameter of the pressing plates, the fine adjustment of microporous structure of the piezoelectric electret film can be realized, and the producing method is strong in practicability, and can be widely popularized and applied. In addition, the invention also relates to the piezoelectric electret film produced by the producing method.