The invention provides a diagnosis and treatment method for noise hazards of central air-conditioning condensing equipment on a building. The diagnosis and treatment method comprises the steps that firstly, the area influenced by vibration and noise hazards is detected, a noise decline curve and a vibration signal distribution image are determined, the noise decline curve and the vibration signaldistribution image are analyzed and assessed, a dangerous part is found, and emphasized treatment is conducted in the later period; secondly, wear and connection inspection and corresponding maintenance treatment are conducted on equipment in a central air-conditioning condensing equipment unit; thirdly, vibration of floor slabs is detected, the vibration transmission problem generated through resonance of the floor slabs and the central air-conditioning condensing equipment unit is analyzed, and corresponding treatment measures are made through vibration spectrum analysis; fourthly, the noiseproblems generated due to intermittent air suction and exhaust of a compressor and acute friction between gas and the pipe wall are analyzed, and the influences of noise generated due to pipeline vibration on the surrounding are reduced by adopting the measures; and fifthly, if the maintenance treatment effect is poor, the noise insulation capability of an enclosure structure is directly improved.