The invention provides a preparation method of an
agaricus bisporus low-salt soybean sauce. The preparation method comprises the following steps of putting soybeans after being subjected to cleaning and
impurity removal into room-temperature water, performing soaking, and performing draining; cooking the drained soybeans until the soybeans are completely cooked; sufficiently and uniformly stirringheated flour with the cooked soybeans when the flour is hot to obtain
mixed materials; after the
mixed materials are cooled, performing
inoculation with
aspergillus oryzae mother starters, and performing culturing until
starter materials are yellowgreen so as to obtain finished starters; and taking
agaricus bisporus
powder or an extraction solution thereof, mixing the taken
agaricus bisporus
powder or the extraction solution thereof with the finished starters to obtain a mixture, putting the mixture into a fermenter for
fermentation, wherein the
fermentation period is 7-10 days, then adding microzyme and
lactic acid bacteria, setting the temperature to be 35-40 DEG C, and continuing performing
fermentation for 5-7 days so as to obtain the
agaricus bisporus low-salt soybean sauce. According to the preparation method disclosed by the invention, a low-salt
solid state fermentation method is adopted, the fermentation time is short, the fermentation temperature is high, growth of infectious microbes is not facilitated, the
agaricus bisporus low-salt soybean sauce is safe to eat, the soybean sauce produced by the method has the advantages of being healthy, environmentally-friendly, lowin cost and short in
production cycle, besides, the soybean sauce inherits the advantages of the
agaricus bisporus, and the soybean sauce obtains favor of consumers.