The invention discloses a silicate bacterium fertilizer capable of increasing the soil rapidly-available potassium content. The fertilizer is composed of the following raw materials in parts by weight: 90 to 110 parts of leftovers in pig slaughter house, 2 to 3 parts of borax, 22 to 26 parts of plant ash, 3 to 5 parts of potassium sulfate, 14 to 16 parts of wheat bran, 23 to 27 parts of coal ash and slag, 4 to 7 parts of monoammonium phosphate, 12 to 14 parts of river mud, 8 to 12 parts of biogas broth, 5 to 8 parts of ceramic particle, 6 to 9 parts of fermented glutinous rice, 5 to 7 parts of tree peony bark, 2 to 4 parts of silicate bacterium inoculant, 4 to 7 parts of wollastonite, and 5 to 7 parts of auxiliary agent. The formula of the fertilizer is reasonable and scientific, the fertilizer can protect the flowers and fruits and shorten the crop mature period, and at the same time the yield is increased. The added silicate bacteria can dissolve the phosphor and degrade the potassium and improve the soil granular structure at the same time; furthermore, the soil rapidly-available potassium content is increased, and thus the high yield of crops can be guaranteed.