Slot type ventilating brick with safety warning structure

The utility model discloses a slit type ventilating brick with a safety warning structure. The safety warning structure can be that a set of warning ventilating holes are arranged on the central bottom in the brick besides the slit ventilating holes used for normally supplying the air. The safety warning structure can also be realized by changing the arrangement form of the slit ventilating holes for normally supplying the air in the range from the safe height to the unsafe height. When the ventilating brick is used to the unsafe height, the air ventilating quantity is suddenly increased or the shape of the ventilating surface is changed to warn the operator to timely change the discarded ventilating brick to guarantee the safe production.