Pit mud curing method, used pit mud curing liquid and preparation method

The pit mud curing method comprises the following steps: A, sterilizing yellow serofluid, adding a carbon source, adjusting the pH value, carrying out anaerobic fermentation for more than 30 days, and discharging supernate to obtain liquid active mud; b, uniformly mixing high-quality aged pit mud, high-quality pit bottom grains and yeast, adding hot water, pulping into slurry, and pumping the slurry into a nutrition tank; c, liquid active mud is added into the nutrition tank, the pH is adjusted to 6.5-7.0, then white spirit is added into the nutrition tank, and the content of liquid ethanol in the nutrition tank is adjusted to 2.5-3.0 wt%; and D, uniformly stirring, sealing, preserving heat and fermenting for more than 20 days. Mainly through two modes of stripping the pit mud of the pit, adding auxiliary materials for mixing, punching and filling the curing liquid for curing, nutrient substances of the pit mud are increased, the growth environment of beneficial microorganisms is improved, and growth and meta