Building energy-saving roof heat insulation structure

The utility model discloses a heat insulation structure of a building energy-saving roof. The heat insulation structure comprises a heat insulation plate, supporting legs and a butt joint structure. By arranging the butt joint structure, when the heat insulation plates are spliced, the butt joint rods and the clamping hooks can be inserted into the butt joint grooves, then the assembled heat insulation plates are pushed downwards, so that the top end faces of the two heat insulation plates are located on the same plane, and at the moment, the heat insulation plates can push the limiting blocks in the butt joint grooves, so that the limiting blocks slide in the butt joint grooves; the limiting blocks are attached to the clamping hooks, so that the inclined surfaces on the limiting blocks and the clamping hooks are attached to each other, meanwhile, the limiting blocks can be pushed and jacked by the heat insulation plates to be limited, the limiting blocks cannot move, and the clamping hooks are limited after