Method for preparing organic carbon fertilizer by utilizing lysine fermenting waste liquid

The invention provides a method for preparing an organic carbon fertilizer by utilizing lysine fermenting waste liquid.The method comprises the specific steps that a pH value of lysine waste liquid is regulated to be 6.0-7.0 by using an acid-base regulator; heating is performed to reach 40-60 DEG C, dipotassium metal sulfate is added, and stirring reaction is performed for 20-60 minutes; then a flocculant is added, reaction is performed for 40-60 minutes; reaction liquid produces a precipitate, standing is performed for 30-60 minutes, and centrifugal treatment is performed, wherein the number of centrifugal revolutions is 500-2000 r/min, centrifuged supernatant liquid is a liquid organic carbon fertilizer, and a lower deposition solid is a solid organic carbon fertilizer; the usage amount of the dipotassium metal sulfate accounts for 1%-5% by mass of lysine waste water, and the mass ratio of the flocculant to the dipotassium metal sulfate is 2-5 to 1-5.The waste liquid and the precipitate left after treatment