According to the Helmholtz-Kirchoff integration theorem, the acoustic field distribution models of two rectangular transducers in acousto-optic crystal are established in this paper. The acoustic field of rectangular transducers with center frequency of 100 MHz in the tellurium dioxide crystal is simulated numerically and visualized by means of MATLAB. The results show that compared with the acoustic field distribution of the single transducer, the Bragg bandwidth of the acousto-optic device is increased by 11 MHz using the structure of the two transducers. The simulation results can be a theoretical basis for understanding the acoustic field change produced in testing medium and judgment for testing performance.