The invention provides a gas supply element, a composite gas supply brick and a manufacturing method of the composite gas supply brick. Gas supply channels, first anti-seepage anti-blockage channels and second anti-seepage anti-blockage channels are arranged in the gas supply element. The first anti-seepage anti-blockage channel is communicated with two or more other gas supply channels through fluid. The second anti-seepage anti-blockage channel is communicated with two or more other gas supply channels through fluid as well. Any two first anti-seepage anti-blockage channels and the corresponding second anti-seepage anti-blockage channel are communicated by the same gas supply channel through fluid. By the adoption of the gas supply element and the gas supply brick with the gas supply elements, steel seepage is not likely to happen in the actual use process, the gas supply channels are not blocked in the gas supply process, the blowing-through rate is high, the oxygen blowing amount is reduced, and the smelting cost is lowered; and due to the high blowing-through rate, the ablation amount of an air brick can be reduced as well, the service life of the air brick is prolonged, and the smelting cost is lowered.