The present invention discloses life nourishing biscuits and a preparation method thereof. The biscuits are made from the following raw materials in parts by weight: wheat flour 60-80 parts, soybean powder 8-15 parts, purple sweet potato powder 8 -12 parts, Chinese yam powder 5-15 parts, vegetable oil 10-20 parts, yacon micro powder 10-15 parts, eggs 5-10 parts, milk powder 6-15 parts, persian walnuts 4-10 parts, pistachios 5-8 parts, baking soda 0.5-1.5 parts, ammonium bicarbonate 1-2 parts, red dates 3-9 parts, Chinese wolfberries 1-5 parts, grape seeds 2-10 parts, honey 8-18 parts, xylitol 1-8 parts, food additives 2-5 parts, table salt 3-10 parts and a proper amount of water. The preparation method is simple and environment-friendly, the produced biscuits are delicious and tasty, and also can promote gastrointestinal peristalsis, promote digestion, regulate gastrointestinal environment, strengthen and tonify spleen, nourish essence and reinforce kidney, resist oxidation, lower blood fat, blood pressure and cholesterol, nourish liver and moisten lung, maintain beauty and preserve countenance and resist fatigue and other functions.