The invention discloses a system and method for eliminating local hot spots of a server cabinet at a data center. The system comprises a server cabinet, a cooling fan group, a fan bracket, a guide rail, a stepping motor, a traction rope, a fixed pulley, a controller and temperature sensors, wherein the stepping motor is connected with the cooling fan group through the traction rope and can drive the cooling fan group to move up and down along the guide rail; and the controller detects local hot spots of the cabinet through the temperature sensors, so that the stepping motor is driven to rotatefor a certain number of turns, the cooling fan group is enabled to reach the air inlet position of an overheated server to increase the air supply volume at the position, enhance heat dissipation andeliminate the local shot spots. The system can automatically carry out accurate air supply on the overheated server, thereby lowering the temperature, ensuring the stable operation of the server, andprolonging the service life. Meanwhile, the air conditioner temperature is avoided from being lowered, and the energy consumption of the data center is reduced.