The invention provides a preparation method of microalgae bait, the microalgae bait is prepared through microalgae culture,
magnetic separation, microencapsulation wrapping,
drying and other methods, during culture, a specific culture solution is added, culture conditions are adjusted,
algae liquid cells are separated by adopting a nano magnetic dispersant, effective components in the microalgae cells are ensured,
mixed cell sap is screened out, and the microalgae bait is prepared. The components in the core material are wrapped through microencapsulation wrapping, the components of the
wall material are used for isolating the external environment, good
oxidation resistance and
water resistance are achieved, notches and pores of the bait are reduced after wrapping, the performance is stable, the storage life is long, the swelling and collapsing time in water is prolonged, collapsing of nutritional ingredients in the core material is delayed, and the bait has the advantages of being good in stability and good in stability. The
loss rate is low, the
acid value change rate is within 2.20%, the
peroxide value change rate is within 1.41%, the
water resistance time reaches 8.5 h, the
loss rate is within 4.85%, the sinking rate reaches 98%, the bait is easy to sink into the water bottom and beneficial to being ingested by aquatic animals, and the
utilization rate of the bait is increased.