Fabricated thermal insulation wallboard

The utility model relates to the technical field of heat preservation layers, and discloses an assembly type heat preservation wallboard which comprises a plurality of outer layer boards, a plurality of limiting cavities are formed in the outer layer boards, a limiting mechanism is arranged in any limiting cavity, a plurality of inserting grooves are formed in the sides, away from the limiting mechanisms, of the outer layer boards, and the inserting grooves are connected with the limiting mechanisms. The limiting cavities and the inserting grooves of the adjacent outer layer plates communicate with one another. The limiting mechanism comprises a sliding rod connected between the inner walls of the limiting cavity, sliding plates symmetrically arranged on the sliding rod and clamping blocks arranged on the sides, close to the inserting grooves, of the sliding plates, the sliding plates are slidably connected into the limiting cavity, and the upper ends and the lower ends of the sliding plates are attached to t