Cold chain heat preservation box

The utility model relates to the technical field of heat preservation boxes, and discloses a cold chain heat preservation box which comprises a box body, buckles are fixedly installed on the two sides of the box body, a box cover is arranged on the top of the box body, L-shaped buckle plates are fixedly installed on the two sides of the box cover, and the L-shaped buckle plates are buckled in the buckles. A sealing plate is fixedly installed at the bottom of the box cover and embedded into the inner wall of the box body, a limiting rod is fixedly installed on the inner wall of the box cover, during use, an object is placed above a leakage plate in the box body, then the box cover is installed on the top of the box body, an extrusion plate below the box cover can fix the object, and when jolting occurs, the box cover is fixedly installed on the box body. When an object is bumped, an extrusion plate moves upwards, so that a first connecting plate rotates, the first connecting plate drives a first connecting sea