The utility model provides a power distribution cabinet ventilation device, and belongs to the technical field of a high-voltage power distribution cabinet. The utility model aims to provide the power distribution cabinet ventilation device capable of detecting a temperature value in the high-voltage power distribution cabinet in real time and controlling size of a ventilation door according to the temperature value so that ventilation in the power distribution cabinet is realized, and a cooling objective is achieved. The adopted technical scheme is that the power distribution cabinet ventilation device comprises a ventilator which is arranged on one side wall of a power distribution cabinet body and communicated with the outside. A motor is arranged in the internal part of the power distribution cabinet body and arranged at the upper part of the ventilator. A master control chip, a temperature sensor and a power supply are arranged at the internal wall of the power distribution cabinet body. The temperature sensor and the power supply are electrically connected with the master control chip. The motor is electrically connected with the master control chip. Whether the motor should be started or not is determined by utilizing temperature data transmitted by the temperature sensor. The power distribution cabinet ventilation device can be widely applied to ventilation of the power distribution cabinet.