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A new kind of miniature high-voltage pulse transformer based on closed magnetic core is developed, and its output characteristics are analyzed in this paper. The amplitude of the output high-voltage pulse of the transformer is 210 kV, the step-up ratio is 1:105, and the effective coupling coefficient is 0.984. The time-domain and frequency responses of the transformer have also been analyzed in detail by circuit theory. The experimental results show that the pulse transformer can respond well to square voltage pulse with a pulsewidth ranging from 5 to 100 ??s and a frequency band ranging from 100 Hz to 500 kHz. With these characteristics, the small pulse transformer with very low cost can be used for applications of dielectric barrier discharge and high-voltage nanosecond-pulse generator.