The invention discloses a method for converting ginsenoside through plant complex enzyme. The method comprises the following steps that ginseng is ground into powder, subjected to low-temperature sterilization and then cooled to the room temperature; the sterilized ginseng powder is evenly mixed with the plant complex enzyme, moisture is adjusted through a sterile LL liquid culture medium and distilled water, the mixture is fully mixed to be uniform, then sealed and put into a constant-temperature incubator for fermentation, and a ginseng fermentation product is obtained; an 80% methyl alcohol aqueous solution is used for ultrasonic extraction, filtering is carried out, filtrate is subjected to vacuum concentration, and coarse ginsenoside extract is obtained; the coarse ginsenoside extract is dissolved by adding deionized water, then subjected to extraction through a saturate n-butyl alcohol solution and subjected to vacuum concentration, and ginsenoside extract is obtained, wherein the ginsenoside extract contains rare ginsenoside with fewer sugar chains or an antineoplastic active material protopanoxadiol (PPD) without sugar chains. The method is simple in process and convenient to implement, and the product is easy to dry; most importantly, in the solid fermentation process, conversion of ginsenoside is achieved, and the rare ginsenoside or the antineoplastic active material protopanoxadiol (PPD) is obtained.