The invention discloses a small-molecule-peptide-compounded-maltodextrin-and-fructose liquid composition. The small-molecule-peptide-compounded-maltodextrin-and-fructose liquid composition is preparedfrom 75-85 parts of maltodextrin, 3-8 parts of xylitol, 15-20 parts of fructose, 2-2.5 parts of zinc gluconate, 1.5-2 parts of sodium citrate, 3.5-4 parts of potassium citrate, 1.2-1.6 parts of ferrous glycine sulfate, 2-2.8 parts of decavitamin, 6-10 parts of small-molecule oligopeptide, 0.09-0.12 part of essence for food, 0.1-0.18 part of potassium sorbate, a PH adjusting agent and purified water. The small-molecule-peptide-compounded-maltodextrin-and-fructose liquid composition is special for pre-operation patients and is an isotonic-pressure, easy-to-absorb and sludgeless product specially designed for replenishing of energy, moisture and electrolytes, reducing of insulin resistance and protecting of an intestinal mucosa barrier.