High-strength refractory brick

The utility model relates to the technical field of refractory bricks, in particular to a high-strength refractory brick which comprises a refractory brick body, a protruding block is fixedly connected to the upper surface of the refractory brick body, a groove matched with the protruding block is formed in the lower surface of the refractory brick body, and a heat preservation layer is arranged in the refractory brick body. According to the refractory brick, the bearing frame, the cross-shaped supporting frame and the bearing through hole are matched, a rigid frame is formed in the refractory brick body, the overall strength of the refractory brick body and the bearing capacity of the refractory brick body are greatly improved, and the service life of the refractory brick body is prolonged; according to the refractory brick disclosed by the invention, the stacking stability can be kept when the refractory brick bodies are stacked and stacked, and the convex blocks are matched with the connecting blocks on th