The invention belongs to the technical field of feed for laying hens and particularly relates to complete feed for laying hens at brood time and a preparation method thereof. The complete feed comprises, by weight, 37-44% of corn, 18-22% of extruded corn, 0.4-0.6% of soybean oil, 18-20% of soybean meal, 9-11% of extruded soybeans, 1.5-2.5% of fish meal, 3.5-4.5% of fermented soybean meal, 1.1-1.2% of mountain flour, 1.4-1.7% of calcium hydrophosphate, 0.14-0.16% of methionine, 0.09-0.13% of choline chloride, 0.1-0.2% of baking soda, 0.2-0.3% of salt, 0.13-0.16% of microecologics, 0.01-0.03% of liquid phytase, 0.03-0.05% of liquid xylanase, 0.1-0.2% of acidifier, 0.1-0.2% of glycine betaine, 0.004-0.006% of antioxidant, 0.015-0.035% of 4% enramycin, 0.03-0.04% of vitamin complex and 0.08-0.09% of composite microelement. The complete feed can meet nutrition requirements of the laying hens at the brood time, improves immunity of the laying hens at the brood time, has remarkable effects on increasing weight and shin length of the laying hens at the brood time, enables the laying hens to reach the standard in advance, and provides a good foundation for achieving high yield at an egg producing period.