Tobacco-seedling root-cutting device with disinfecting and sterilizing functions

The utility model relates to a tobacco-seedling root-cutting device with disinfecting and sterilizing functions, which relates to the technical field of special cutting devices for floating seedling culture. A root cutter and a servo motor are arranged on a bracket of the device, and the structure of the root cutter is that: an upper opening is arranged at the upper part of a shell, a lower opening is arranged at the bottom of the shell, a motor-shaft end of the servo motor is fixedly connected with a root-cutting knife disk, the root-cutting knife disk is arranged in an inner cavity of the shell, root-cutting knives are uniformly and fixedly connected onto the root-cutting knife disk, the maximum turning radius R of the knifepoint of each root-cutting knife is equal to a distance H from the center of a motor shaft to the bottom of a tobacco floating seedling-culturing disk, R=H, and the inner cavity of the root cutter is provided with an ultraviolet generating device. The tobacco-seedling root-cutting device