The invention discloses a sine trapezoidal power transmission waveform. When AC voltage is in a polarity reversal period, a sine wave waveform is adopted by the AC voltage and the polarity and a voltage value of the AC voltage synchronously change along with a sine wave with the same frequency and amplitude; and when the AC voltage is in a steady-state period, the polarity and the voltage value of the AC voltage remain unchanged. The invention further discloses an application of the sine trapezoidal power transmission waveform. By the sine trapezoidal power transmission waveform and the application thereof, the disadvantages of the prior art can be improved; the impact of a square wave on equipment is avoided; and the condition that an effective value of the overall power transmission waveform is much greater than that of a standard sine wave is also ensured, so that the conveying capacity of a line is significantly improved.