Fat powder capable of reducing death and culling rate of weaned piglets as well as preparation method and application of fat powder

The invention relates to fat powder capable of reducing the death and culling rate of weaned piglets and a preparation method and application of the fat powder. Composite lipid in preparation raw materials of the fat powder comprises 1, 3-dioleic acid-2-palmitic acid triglyceride, 24-degree palm oil, rice bran oil, coconut oil, linseed oil, caprylic acid triglyceride, capric acid triglyceride, alpha-lauric acid monoglyceride and tributyrin. According to the invention, fatty acid composition similar to the structure of pig milk fat is developed, so that the piglets are enabled to continue the lactation period in the weaning period and take lipid as a main energy obtaining way, the composite energy requirements on high, medium and low speeds are met, and the falling into energy potential difference is avoided; and the specific combination of medium-chain fatty acid and short-chain fatty acid can improve the energy obtaining efficiency of the piglets in the weaning period, has antibacterial and disease-resistant