Thermal insulation cellular board and production process

The invention discloses a heat preservation cellular board and a production process, the heat preservation cellular board comprises an outer frame, a foaming layer and a cellular core, the outer frame is of a rectangular frame structure, the foaming layer is filled in the outer frame, the cellular core is pressed in the foaming layer, the cellular core is located in the outer frame, and the foaming layer is arranged in the outer frame. The center of the outer side of the outer frame is fixedly sleeved with a connecting piece of a rectangular frame structure, clamping grooves are formed in the outer edge of the top end and the outer edge of the bottom end of the outer frame, a first assembly part is clamped to the top end of the outer frame, a second assembly part is clamped to the bottom end of the outer frame, and a first buckle plate is buckled to the top end of the first assembly part. A second buckle plate is buckled at the bottom end of the second assembly part; the bottom end of the first buckle plate i