The sustained development and trial operation of an optical current transducer based on the theory of Faraday magnetic-optic effect in power systems shows that the application of the optical current transducer has definite economic and social benefits. A new type of optical current transducer based on the electronic speckle-shearing pattern interferometer is presented in this paper and the design of the magnetic sensor is discussed. The magnetic force， which is generated by the to-be-measured current， makes the sensor deform， and the charge-coupled device（CCD） records the deformed image to obtain the value of the current by image data processing. Experiments on the repeatability and anti-interference capability in laboratory show the optical current transducer is useful in practice.