The invention relates to a rice-pattern decorated ceramic glaze with an antimicrobial function and a preparation method of the rice-pattern decorated ceramic glaze, which belong to the technical field of ceramic glazes. The rice-pattern decorated ceramic glaze disclosed by the invention is composed of the following components: montmorillonite, kaolinite, quartz, talcum, potassium feldspar, glaze stone, wollastonite, dolomite, sodium carboxymethyl starch, zinc oxide and barium carbonate. The preparation method comprises the following steps: after the raw materials are prepared, carrying out ball milling and sieving the obtained object, pouring a glaze on a ceramic blank engraved with rice-pattern decorated holes, carrying out unglazed firing on the obtained product, and carrying out high-temperature firing, so that a rice-pattern decorated ceramic glaze with an antimicrobial function is obtained. In the rice-pattern decorated ceramic glaze disclosed by the invention, wollastonite is adopted for replacing traditional glaze ash, so that the prepared rice-pattern decorated ceramic glaze product is full bodied, rich and crystal clear, and has a deeper dark green color and better transparency; by using the strong property of the added montmorillonite component, the rice-pattern decorated ceramic glaze product has a fixation and inhibition effect on viruses and bacteria as well as toxins produced by the viruses and bacteria in the air, and therefore, the rice-pattern decorated ceramic glaze has the function of inhibiting bacterial growth, and can be used as a mildew preventive.