A compound zirconium silicate opacifying agent, a preparation method therefor and an application thereof. The compound zirconium silicate opacifying agent is prepared by using the following materials comprising components in percentage by mass: zirconia sand 65%-84%, calcined alumina 1%-15%, low temperature frit 15%-30%; and the low temperature frit is prepared by using the following raw materials comprising components in percentage by mass: potassium feldspar powder 25%-35%, apatite powder 10%-20%, fluorite powder 2%-8%, calcium carbonate 10%-15%, borax 15%-18%, zinc oxide 1%-8%, quartz powder 2%-8%. A glazing L value of the compound zirconium silicate opacifying agent is substantially higher than 91, and the opacifying effect is desirable. Production costs may be reduced while effectively controlling the radioactivity of the product.
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