The invention provides a preparation method for plant enzymes. According to the method, a plurality of plants, vegetables and fruits, seeds, herbal medicines, mushrooms and alga are used as raw materials, natural extraction of plant enzymes is carried out to obtain liquid containing plant active components, and a liquid stock solution of plant enzymes is obtained after fermentation and maturation of the liquid containing plant active components; the obtained liquid stock solution of plant enzymes contains a multienzyme ferment, a protein decomposition enzyme, a fat decomposition enzyme, a starch decomposition enzyme, proanthocyanidin, a plurality of natural vitamins, mineral matters, amino acids, trace elements, etc. The obtained liquid stock solution of plant enzymes is prepared into plant enzyme oral liquid, plant enzyme solid powder or plant enzyme capsules. The preparation method provided in the invention has the following advantages: preparation conditions in the method are simulation of natural generation conditions of enzymes, so preparation theory is scientific; preparation equipment is simple, applicable to large scale production; obtained plant enzymes never contain artificial pigments, synthetic fragrances or antiseptics, and are pure natural. The plant enzymes can be extensively used in health products or cosmetic and make-up products.