An air injection apparatus for vehicle air suspension can more accurately detect an air leakage which is generated in the vehicle air line before injecting the air to the vehicle air suspension system. An air injection apparatus for vehicle air suspension comprises an air leakage check module(40). The air leakage check module includes a leakage test air line(L2) which is branched from a back end air line(L1) of an air switching valve(41) into a first sub line(SL1) and a second sub line(SL2), a vacuum pump(42) which is installed on the first sub line and creates vacuum pressure in the vehicle air line through the whole leakage test air line and an output stage valve(30), a first switching valve(44) opening and closing a flow channel and a first vacuum sensor(43) detecting the vacuum pressure, which are installed on the first sub line, and a second switching valve(46) opening and closing a flow channel and a second vacuum sensor(45) detecting the vacuum pressure, which are installed on the second sub line.
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