Compound emulsifier for increasing fat utilization rate of aquatic feed

The invention relates to the technical field of feed additives, and particularly provides a compound emulsifier. The compound emulsifier comprises sucrose fatty acid ester, modified phospholipid, calcium stearoyl lactylate, fatty acid monoglyceride, glycerin fatty acid ester, L-carnitine, bile acid, a silybum marianum extract and lipase. The compound emulsifier has a favorable emulsification effect, and various emulsification components are synergistic to form a uniform and stable emulsification system. The compound emulsifier can be applied to the field of aquatic feeds, has the capabilities of effectively promoting the digestibility of aquatic animals, including Tilapia mossambica, weevers and carassius auratus gibelio, to fat in a feed, improving the weight increment and reducing the feed coefficient, and can be also used for enabling the digestibility of a low-energy feed to reach, and even exceed a basal feed level by adding the compound emulsifier, thus facilitating to reduce the addition amount of oil and fat in the feed, reduce the feed cost, and increasing the economic benefit of raising households.