Preparation method of unglazed health-preserving black sand marmite

The invention belongs to the technical field of earthenware cooking pot preparation, and particularly relates to a preparation method of an unglazed health-preserving black earthenware earthenware cooking pot, which comprises the following specific steps: raw material preparation, pretreatment, mud preparation, molding, drying, mud spraying, firing and polishing. According to the preparation method disclosed by the invention, various functional raw materials are selected for proportioning, the raw materials are mixed after pretreatment, glazing is not needed, the working procedures are simplified, and the obtained black sand marmite is excellent in overall performance, not only has the properties of high temperature resistance, durability and the like of a common marmite, but also is good in heat preservation and quality guarantee performance; beneficial trace elements can be slowly released in the using process, the nutritional value of food is improved, and the health-preserving food has a certain health-pr