Thin film distillation column is a coupling device between thin-film evaporator and distillation column. In the process of distillation, thin film distillation column can solve the problem of thermal decomposition of heat-sensitive materials, which caused by too high temperature in the tower bottom and too long residence time in the reboiler. It prevents deterioration reactions such as decomposition, polymerization and oxidation of materials when heated, and effectively protects the characteristics of product materials; At the same time, compared with the traditional thin-film evaporator, the thin-film distillation column increases the function of distillation, which can better improve the purity of products and reduce more purification process steps.