With the increasing demand for high-temperature gas filtration, porous intermetallic compounds have attracted extensive attention due to their excellent high-temperature oxidation and acid/alkali corrosion resistance, good machinability. In this study, porous Cu-Al-Si intermetallic compounds with three-dimensional structure were rapidly prepared by a novel heat explosion reaction. The effects of Si addition on their oxidation resistance and corrosion resistance were compared. The results show that the minimum weight gain of the Cu-Al-Si product is only 1.48% after oxidation at 800 °C for 288 h. Si promotes the formation of a continuous Al₂O₃ protective layer on the skeleton surface of the porous Cu-Al-Si product, maintains the internal matrix intact, and improves the oxidation resistance of the porous Cu-Al-Si. Due to the addition of Si, the porous intermetallic compounds of Cu-Al-Si system are more stable in acidic environment (0.5 M/L H₂SO₄) with lower mass loss, demonstrating excellent acid corrosion resistance.