The invention relates to a formula, a preparation method and application of a water-in-
oil type liquid
vitamin premix. The liquid
vitamin premix consists of three groups of liquid
vitamin ingredientsA, B and C, wherein the A group of liquid vitamin ingredients consist of vitamins A, D3, B12 and E; B group liquid vitamin ingredients consist of vitamins B1, B2, B3, B5 and B6 and
biotin; the liquidvitamin ingredient group C consists of
vitamin K3, and in the post-spraying application of vitamins, the three liquid vitamin ingredient groups can be spontaneously emulsified into a water-in-oil typeliquid vitamin concentrated solution after being mixed, and the water-in-
oil type liquid vitamin concentrated solution is synchronously sprayed on the feed along with
grease after being diluted by the
grease; according to the premix, through reasonable compatibility, reaction or degradation among vitamins is avoided, and the stability of the vitamins is improved; a water-in-oil vitamin concentrated solution is formed through spontaneous emulsification so that the
energy consumption is reduced; the spraying process is completed after
grease dilution so that high feed
moisture caused by water
dilution in the spraying process after oil-in-water type
liquid vitamins are sprayed is avoided, and the risk of feed mildewing is reduced.