The invention provides a transformer station safety barrier sound prompting apparatus. The apparatus comprises a fence, the fence comprises a first fixation column, an isolation net and a second fixation column, the two sides of the isolation net are respectively provided with the first fixation column and the second fixation column, the first fixation column is provided with an infrared emitter and a control chip, and the second fixation column is provided with an infrared receiver and an alarm device. According to the invention, infrared light emitted by the infrared emitter can reach the infrared receiver under the condition of no external interference, when someone dismounts, moves and crosses a barrier without permission, the infrared light emitted by the infrared emitter cannot reach the infrared receiver, at the moment, the infrared receiver emits signals to the control chip, and the control chip controls the alarm device to give an alarm.