The present invention discloses a cabinet cooling system for servers of a cloud computing computer room. The cabinet cooling system comprises a closed cabinet; the cabinet is used for placing server chassis; Hot air exhaust pipes are arranged at one sides of the server chassis and cold air boxes are arranged at the other sides of the server chassis; an air conditioning cold wind outlet is connected with a cold wind flow pipeline; the cold wind flow pipeline is connected with a plurality of cold wind conveying pipes by a cold wind flow dividing apparatus; the cold wind conveying pipes are connected with the cold air boxes; electromagnetic control valves are arranged on all the cold wind conveying pipes; a unidirectional centrifugal fan is arranged on the cold wind flow pipelines; a wind inlet frequency converter is mounted on the unidirectional centrifugal fan; a hot air fan is arranged at the upper part of the cabinet; a wind outlet frequency converter is arranged on the hot air fan; and the signal input ends of the wind inlet frequency converter, the wind outlet frequency converter and the electromagnetic control valves are all connected with a controller. The cabinet cooing system has a simple structure, is convenient and rapid to mount, efficiently solves the problems of overheated local parts and hot spots of the servers, has good radiating and cooling effects and ensures safety and reliability of operation of the servers.