The invention discloses a technology for preparing Suanjiang tofu from LAB (
lactic acid bacteria) fermented yellow serofluid. The technology comprises the following steps: (1) a seed liquid is prepared from
lactobacillus plantarum and inoculated to the yellow serofluid for
fermentation, and Suanjiang is obtained; (2) the final pH value of the Suanjiang obtained in the step (1) is regulated to 3.8-4.0 with food-grade glacial
acetic acid, and a tofu coagulant is obtained; (3) cooked soybean milk is prepared from soybeans through
impurity removal, cleaning, soaking,
mashing, residue removal and boiling; (4) the tofu coagulant obtained in the step (2) is added to the cooked soybean milk obtained in the step (3) in a segmented manner for
curdling until a
precipitation phenomenon is observed, a product is poured into a frame where tofu cloth is laid, and subjected to tight packaging with a mesh, flat covering, self-draining and pressurizing, pressure is kept, pressing is performed for a fixed period, and the Suanjiang tofu is obtained through forming. The technology has the advantages that the technology is simple, the operation is convenient, the stability is good,
continuous production can be realized and the like, and
technical support is provided for industrial
mass production.