The invention discloses a structure of a centrifugal fan of a three-phase asynchronous motor. The centrifugal fan of the three-phase asynchronous motor comprises a fan plate (1), fan blades (2) and a fan base (3), wherein a plurality of installation holes (4) are punched in the fan plate, and a balancing block is mounted on the fan plate (1) through bolts penetrating through the installation holes (4). The centrifugal fan of the three-phase asynchronous motor is simple and reasonable in structure, more suitable for the dynamic balance technology, convenient to operate, low in cost, good in manufacturability, high in reliability, and convenient to install and maintain.