The adoption of polarized light interference demodulation for the traditional optical voltage transducer to detect light intensity to achieve the voltage measurement has led to a small measurement range and significant influence by temperature drift and crystal's additional birefringence.This paper proposes a new type of optical voltage transducer based on convergent polarized light interference，with the crystal electro-optical phase converted to the spot image's rotation angle.This new methodology is independent of light intensity，has wide measurement range from 0°to 180°，and its voltage measurement range is not restricted by crystal half-wave voltage.A detailed analysis is made on the theory of this new transducer and the method of how to read the spot's rotation angle is given.The actual measurement results are also presented to show the good linearity of the new transducer's sensing angle up to 320°.