Preparation method for tobacco pigments

The invention discloses a preparation method for tobacco pigments. Raw materials are taken from wasted tobaccos, the prepared tobacco pigments can be reasonably compatible with tobacco products when used for the tobacco products, adverse effects cannot be caused, and the color of the tobacco pigments is natural and real, and is close to that of natural tobacco. According to the preparation method for tobacco pigments, protein, pectin, redundant sugar, nicotine, inorganic salt and the like in tobacco extracts can be effectively removed by coupling technologies of microfiltration decontamination, macroporous resin adsorption separation and ultrafiltration separation purification, so that the prepared tobacco pigments are high in color value and high in purity, and do not have foreign flavor when used for tobacco products. In addition, because the extraction temperature and the purification temperature are low, destruction on thermosensitive substances in tobaccos is reduced, and the own flavor of the tobaccos is maintained.