Abstract: Combined with the transformed model equation of rotating magnetic fields and the boundary renewal method, the k-ε turbulent model was used to analyze the flow field in the continuous casting process of steel under the action of a rotating magnetic field. The electromagnetic field makes molten steel whirl in the horizontal plane, decreases the downward velocity and speeds up the vortex. The horizontal rotating velocity decreases gradually downwards from the vertical center of the stirring area. The rotating velocity increases with the increasing of both electric current and frequency, with a distribution of single peak values on the horizontal plane and the maximum occurs near the wall.