The invention discloses a forced ventilation air-air cooler for a variable-frequency motor. According to the technical scheme of the invention, a centrifugal fan is adopted as an air-blast element of an outer air path. The drive motor of the centrifugal fan is fixed on a cooler body. An L-shaped wind scooper is of an arc transition type air-guiding structure composed of an arc-shaped air-guiding plate, and is connected with a tube plate at the air inlet end of the air-air cooler body via a square flange. The arc-shaped air-guiding plate is of the arc transition type air-guiding structure. Under the guiding effect of the arc-shaped air-guiding plate, the cooling air flow is guided to uniformly blow towards the air inlet of a cooling tube bundle. By means of the forced ventilation air-air cooler, the vibration problem of the drive motor can be solved. Meanwhile, the air pressure of the air path is effectively improved. At the same time, the cooling blast capacity and the heat dissipation efficiency of the cooler are improved. Therefore, the cooling and heat dissipation requirements of the high-power variable frequency motor can be met.