The invention relates to a juvenile Chinese softshell turtle expanded feed. The juvenile Chinese softshell turtle expanded feed comprises the following components in parts by mass: 20 to 25 parts of small trash fishes, 10 to 15 parts of water earthworm meal, 5 to 10 parts of yam flour, 8 to 10 parts of purple sweet potato flour, 4 to 6 parts of orange peel powder, 5 to 8 parts of egg yolk, 4 to 7 parts of egg white, 0.06 to 0.1 part of glycine, 0.5 to 0.8 part of krill oil, 0.1 to 0.15 part of tea polyphenol, 0.05 to 0.1 part of glycine betaine, 0.02 to 0.04 part of monocalcium phosphate, 0.1 to 0.25 part of soybean oligosaccharides, 0.1 to 0.18 part of xylooligosaccharide, and 0.08 to 0.1 part of plant adhesive. The invention also relates to a preparation method of the juvenile Chinese softshell turtle expanded feed. Compared with the prior art, the juvenile Chinese softshell turtle expanded feed has the advantages that the nutrition is rich, the nutrition required by the growth of juvenile Chinese softshell turtle is provided, the survival rate and growth rate of juvenile Chinese softshell turtle are obviously improved, the feed coefficient is reduced, the stability in a water body is good, the easiness in disintegration is avoided, the waste of feed is little, and the pollution to water quality is little.