The process, inductor structure, and screen of electromagnetic shaping for plate-form with big width-to-thick ratio is studied. The results indicate that the logical structure of inductor can melt plate-form equably along its perimeter in cross section and confide melt to a certainty. Screen can regulate the magnetic flux density distribution to assure melt in ideal state in shaping inductor. There is a rational drawing velocity to match electrical power at the constant conditions. At last, the superalloy plate-form parts with qualified surface and directional solidification structure are obtained.