To solve the problem of complex echo signal and low signal-to-noise ratio caused by internal and external radiation of guided wave in the traditional electromagnetic ultrasonic omnidirectional guided wave transducer, a novel electromagnetic ultrasonic omnidirectional guided wave transducer (OUT-EMAT) is designed. The control method of double coil parameters and double excitation source is studied. The intensity and direction of guided wave radiation are controlled. According to the theory of the electromagnetic ultrasonic omnidirectional transducer, the mathematical model of wave displacement superposition is formulated, and the performance of OUT-EMAT is simulated and tested. Compared with the traditional omnidirectional EMAT, Simulation results show that the OUT-EMAT makes the ratio of internal and external radiation guided wave amplitudes change from 1 ∶ 1 to 2 ∶ 9. The external radiation is enhanced about 100% and the internal radiation is suppressed about 55. 6% . The new OUT-EMAT enhances the signal to noise ratio of detection echo, reduces the complexity of signal and improves the accuracy of crack location. It provides a new method for identifying crack defect effectively, which has guiding significance for practical engineering application.