Thermal insulation pipe cutting device

The utility model discloses a thermal insulation pipe cutting device and solves the technical problems that part of existing thermal insulation pipe cutting devices mentioned in the background technology can only clamp thermal insulation pipes of specific specifications, thermal insulation pipes of different specifications cannot be installed, and the clamping and positioning functions are limited. Comprising a working box, a first cavity, a second cavity and a horizontal placing plate are arranged in the working box, the first cavity is arranged above the placing plate, the second cavity is arranged below the placing plate, openings with the same height are formed in the two opposite side walls of the working box respectively, and the openings are communicated with the first cavity and the second cavity. The two opposite outer side walls of the working box are each provided with a clamping assembly used for clamping heat preservation pipes with different diameter sizes, the two clamping assemblies are arrang