Preparation technique of natural pigment from red jujube peel

The invention relates to a preparation technique of natural pigment from red jujube peel. Firstly, viscous pectin in a jujube peel is removed to ensure the powder state of a finished pigment product; extraction is carried out at room temperature to ensure the chemical stability and the natural state of the pigment product; and alkali dissolution and acid deposition are carried out with simple process and low cost. The preparation technique is characterized by comprising the following steps of: firstly, extracting and removing the pectin in the jujube peel by using an acid extraction method; then, extracting the jujube peel pigment with a water solution of sodium hydroxide at room temperature, and carrying out fine filtration to remove tiny peel dregs and other impurities from the pigment extracting solution; and finally, adding concentrated acid to deposit the pigment, centrifuging, cleaning the deposits with acidulous water to remove salts in the pigment, centrifuging and drying to obtain a pigment product.