PURPOSE: A repair and reinforcement injecting device for a crack and a water leakage in a building is provided to prevent the continuous progress of a crack and a water leakage in an outer wall, a retaining wall, a ceiling, etc. and to repair/reinforce a wall firmly. CONSTITUTION: The repair and reinforcement injecting device(10) for a crack and a water leakage in a building comprises the steps of installing a compressor(22) in a case(20), coupling a filling pipe(30) provided with an inclined branch pipe(31) on the front side of the case(20), coupling a nipple(32) to the front end of the branch pipe(31), coupling a ball valve(40) in the rear of the branch pipe(31) of the filling pipe(30), coupling a coupling bar(26) unified with a stopper(25) on a shifter(23) installed to an inner spring(24) of the case(20) through a coupling hole(27), forming a hanging projection(28) on the inner end of the stopper(25), and forming hanging grooves(29) on the surface of a cap(21) to be separable and combinable mutually.
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