NOVELTY - Preparing animal and plant nutrition liquid involves (a) removing foam from potato cell liquid and sterilizing the potato cell liquid, (b) adding auxiliary material containing molasses, ammonium sulfate, calcium carbonate, magnesium sulfate, sodium selenite, potassium iodide and cobalt chloride to the liquid and stirring uniformly to obtain mixed liquid, and (c) inoculating photosynthetic bacteria, yeast and lactic acid bacteria in the mixed liquid, subjecting the liquid to anaerobic culture, filtering and filling the product and preserving the product.    USE - The method is useful for preparing animal and plant nutrition liquid used for farming and breeding livestock, and as protein feed raw material.    ADVANTAGE - The method is cost-effective and environmentally-friendly, as nutrition rich waste raw material generated through potato deep processing is recycled. The prepared liquid supplements crop nutrition rapidly, prevents disease and reduces disaster.    DETAILED DESCRIPTION - Method for preparing animal and plant nutrition liquid involves (a) removing foam from potato cell liquid and adding potato cell liquid in a stainless steel reaction tank and sterilizing the potato cell liquid at 60-63 degrees C for 30 minutes, (b) adding auxiliary material comprising 7-12 wt.% molasses, 3-5 wt.% ammonium sulfate, 5-7 wt.% calcium carbonate, 0.5 wt.% magnesium sulfate, 0.3 wt.% monopotassium phosphate, 0.02-0.82 wt.% copper sulfate pentahydrate, 0.18-0.74 wt.% ferrous sulfate heptahydrate, 0.18-0.56 wt.% zinc sulfate heptahydrate, 0.04-0.32 wt.% manganese sulfate, 0.01-0.08% sodium selenite, 0.02-0.07 wt.% potassium iodide and 0.01-0.05 wt.% cobalt chloride to 75-80 wt.% cell liquid, and stirring uniformly at 38 degrees C to obtain mixed liquid, and (c) inoculating photosynthetic bacteria, yeast and lactic acid bacteria in the mixed liquid, subjecting the liquid to anaerobic culture at 33-38 degrees C for 72 hours, filtering and filling the product and preserving the product at 5-30 degrees C.