Weaned pig feed

The invention discloses a weaned pig feed which comprises the following components in percentage by weight: 50.5 to 63 percent of corn, 8 to 13.5 percent of bean pulp, 4.5 to 7.5 percent of fermented soy, 1.5 to 3 percent of plasma proteins, 4 to 6 percent of fish meal, 7.5 to 13 percent of extruded soybean, 3 to 6.5 percent of whey powder, 0.5 to 1.5 percent of wheat middling, 0.25 to 0.85 percent of plant oil and 1.25 to 4.15 percent of a pre-mixed material, wherein the pre-mixed material consists of an additive and a pre-mixing agent; the additive comprises the following components in percentage by weight: 0.35 to 0.4 percent of trace element, 0.03 to 0.04 percent of various vitamins, 0.05 to 0.06 percent of 10 percent of polymyxin E sulfate, 0.01 to 0.02 percent of complex enzyme, 0.01 to 0.02 percent of an acidifying agent, 0.05 to 0.06 percent of sodium bicarbonate, 0.1 to 0.2 percent of diaminocaproic acid, 0.05 to 0.2 percent of methionine and 0.25 to 0.3 percent of choline; and the pre-mixing agent c