The utility model discloses a brick used for the top of the tuyere of a blast furnace. The brick transversely penetrates the top or the bottom of the tuyere; the cross section of the brick adopts a structure taking the shape similar to an isosceles trapezoid; the upper surface and two side surfaces of the brick used for the top are rectangular plane surfaces; the two end surfaces of the brick are plane surfaces; and the upper surface of the brick is wider than the lower surface thereof and is a concave cambered surface. The brick used for the top of the tuyere has a simple and regular structure, is easy to splice and combine, is favorable for implementation, and helps to increase the construction speed; the brick can be formed through machine moulding, the quality is stable, and the efficiency is high, so that the economical effects of lowering the manufacturing cost, being convenient for field masonry and improving the service life can be achieved; besides, the inner and the outer surfaces of a built tuyere are plane surfaces, so that the inner and the outer surfaces of the tuyere are plane surface, then the edge of the tuyere can be processed conveniently, a ring-shaped groove can be formed on the edge of the tuyere easily, and plugging and sealing are facilitated.