Thermal insulation device based on phase change material

The utility model relates to a heat preservation device based on phase change materials, which comprises a bottom cover and a top cover, a box body is arranged between the bottom cover and the top cover, a plurality of lock catches are fixedly connected between the box body and the bottom cover and between the box body and the top cover, the box body is composed of a plurality of box walls, a plurality of tenons are fixedly connected between the box walls, and heat exchange assemblies are fixedly connected on the box walls. A switch assembly is arranged in the heat exchange assembly, a control device is fixedly connected to the outer end of the box wall, and by the adoption of the structure, a user can control the switch assembly by manually operating the control device, so that the heat exchange process is flexibly controlled, different heat preservation requirements are met, a switch mechanism is driven through magnetic force, and the heat exchange process is more flexible and controllable; the heat conduct