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Aiming at improving the trapping performance of submicron particles, the magnetic field was introduced into the outer vortex electrostatic cyclone (ESC), and the dust-removal mechanism under the action of electromagnetic field was investigated. Besides, the theoretical model was established to analyze the interaction between fluid flow field, electromagnetic field and particle dynamic field, and the influences of magnetic field on submicron particles collection efficiency at different working voltages and gas velocities were simulated and discussed. The results indicate that the introduction of magnetic field obviously enhances the ESC trapping performance for submicron particles. High working voltage and low gas velocity at a given magnetic flux density are both more favorable for trapping submicron particles, but the magnetic field effect is more obvious at high gas velocity, as well as at low working voltage. Furthermore, at the same working voltage and gas velocity, the contribution of magnetic field to collection efficiency increases with the applied magnetic flux density increased, but the increment gradually decreases, which can lay significant foundation for optimal design of submicron particles removal in ESC.