| Aimed at the problem of insufficient adhesion during train traction and braking, a novel electromagnetic thickening device mounted on the bogie is proposed based on the principle of electromagnetic action. Around the high-speed rotating wheel,the electromagnetic coil is set, the basic structural model of the electromagnetic thickening device is established,an electromagnetic field between the wheel and the rail is formed, and the variation law of the electromagnetic force between the wheel and the rail with the train speed, and the impact of electromagnetic attraction on the wheel rail adhesion are analyzed. By adjusting the coil height and thickness ratio and the arrangement around the upper and lower spaces of the wheel, the magnetic field strength and the magnetic field line distribution near the wheel-rail contact are strengthened, and the electromagnetically-adhesive device magnetic conductive shell form and the air gap control magnetic circuit are guided and scoped, and the vehicle is considered,taking into consideration the limit and installation conditions to optimize performance and structural parameters. The simulation results show that the electromagnetic thickening device can significantly improve the vertical pressure between the wheel and rail at each speed stage, and can increase the wheel-rail adhesion. At the same time, by adjusting the pressure at both sides of the wheel, the running stability of the train can be improved.