Application of boletus edulis in reducing nitrite content in fermented food or pickled food

The invention discloses an application of boletus edulis in reducing the nitrite content in fermented food or pickled food. Experiments testify that if boletus edulis is fermented together with common pickle ingredients, the nitrite content in the pickle ingredients can be reduced remarkably, wherein the boletus edulis and the common pickle ingredients are fermented for 4 days with the mass ratio of 1.4 to 1, and compared with the common pickle ingredients which are fermented individually, the nitrite content can be reduced by 97 percent. According to the invention, fermenting food or pickling food with the boletus edulis is low in cost, simple in process, and the quality and safety of fermented products are excellent. If putting the boletus edulis into the pickle processing and other food processing industries is carried out, the boletus edulis can play a positive role both in the continuous development of the industry and the improvement of market competitiveness of the product.