Thermal-insulation autoclaved aerated concrete block

The utility model discloses a heat preservation autoclaved aerated concrete building block, which relates to the technical field of aerated concrete building blocks and comprises a building block main body, the upper end of the building block main body is integrally provided with a top limiting block, the outer surface of the top limiting block is provided with a first limiting annular groove, and the lower end of the building block main body is provided with a bottom limiting groove. A right limiting block is integrally arranged on the right side of the building block body, a second limiting annular groove is formed in the outer surface of the right limiting block, and a left limiting groove is formed in the left side of the building block body. The two building block bodies are flush in the horizontal direction through clamping of the left side limiting groove and the right side limiting block, the two building block bodies are flush in the vertical direction through clamping of the bottom limiting grooves