Concave-convex blind hole baking-free brick

The utility model provides a concave-convex blind hole baking-free brick. The baking-free brick usually includes solid bricks, through hole bricks and blind hole bricks, while the solid bricks consume more raw materials, the through hole bricks are higher in engineering cost, and the blind hole bricks have less one-time produced brick bodies by moulds. The concave-convex blind hole baking-free brick adopts the technical scheme that the interior of a rectangular brick is provided with 1-5 blind holes along the direction of brick height, each blind hole is a groove body with two circular arc-shaped ends, the surface opposite to the opened surface of each blind hole is provided with a protrusion matched with the corresponding blind hole, the protrusions are smaller than blind holes, and thus the protrusions and the blind holes can be conveniently connected by concrete mortar. Since the interior of the rectangular brick is provided with the groove body-shaped blind holes with two circular arc-shaped ends along th