The invention provides an electromagnetic positioning device, which comprises an induction positioning plate. The outer boundary of a side of the induction positioning plate is equipped with a fixing plate. A support base is mounted on the fixed plate on the front of the induction positioning plate. The lower portion of the support base is equipped with a track on which a projectile is disposed. A slide rod is mounted on the support base. A first spring is mounted on the slide rod. One end of the slide rod in the length direction is located at one side of the projectile, while the other end of the slide rod is located at the outer side of the fixing plate. The back of the induction positioning plate is provided with horizontally and vertically arranged coil array circuits. A USB interface is disposed in the induction positioning plate and is connected with a computer through a line. The projectile has an upper shell and a lower shell, and forms a cavity once being closed. A battery is mounted in the cavity and is connected with a circuit board via a wire. The circuit board is connected with a magnetic core coil via the wire. The invention can display the horizontal projectile motion as the resultant motion of the uniform linear motion in a horizontal direction and the free-fall motion in a vertical direction via the computer, and has the advantages of easy operation, low maintenance rate and long service life.