The invention provides a support-free perforated metal film preparation method, comprising the steps of 1, uniformly mixing metal powder and poval in a ball-milling mode to obtain slurry; 2, coating the slurry onto a basal body face, and stripping after drying to obtain a support-free metal film blank; 3, placing ceramic padding and the support-free metal film blank into a sintering die, enabling the ceramic padding to fully wrap the support-free metal film blank, and then performing processes of pre-sintering preprocessing, pre-sintering, sintering and cooling to obtain the support-free perforated metal film. The support-free perforated metal film preparation method is simple in process and low in production cost, has lower demands on production equipment, and is suitable for large-scale industrial production; and the support-free perforated metal film produced according to the preparation method is small and uniform in aperture, high in porosity, and far higher in filtering efficiency compared with a traditional metal film, and can be widely applied in industrial fields such as petroleum industry, bio-pharmaceuticals, food, beverage and water treatment.