Aquaculture water purifying agent and preparation method thereof

The invention discloses an aquaculture water purifying agent, which consists of modified zeolite, calcined dolomite and tourmaline particles as raw materials, wherein the weight percentage of the modified zeolite is 10 to 70 percent; the weight percentage of the calcined dolomite is 10 to 70 percent; the weight percentage of the tourmaline particles is 10 to 50 percent. The invention also discloses a method for preparing the aquaculture water purifying agent. All the raw materials used in the invention are environmental mineral materials and cannot cause secondary pollution. The purifying agent has the advantages of active regulatory effect on micro-ecosystems in aquaculture water, as well as good economic and social benefit.