The invention discloses an hydrolyzed puffing forage and preparation method thereof. The method comprises: choosing the plants with high wood-fiber content such as straw, cereal shell, corn core, coconut cover, palm leaf, wood/bamboo scraps, bagasse, herbage rhizome and weed, performing hydrolysis and puffing treatment for destroying the encapsulation effect of lignin to hemicellulose and cellulose, degrading the hemicellulose and cellulose into small molecule soluble sugar, and continuously extruding and puffing by force. The continuous forced feeding and discharging technology realizes stable transitions between different pressures. The invention increases digestion rate greatly, can substitute part of corn and wheat bran, and can be prepared into complete feeds for different birds or animals in different growth stages by adding protein forage, salt, vitamin, mineral elements and aminating agent. The hydrolyzed puffing forage of the present invention has similar digestion rate with the conventional grain forage and sweeter taste, reduces cost greatly, alleviates the grain shortage difficulty, and is suitable for pig, cattle, sheep, chicken, duck, goose, rabbit and specially raised pets.