The invention provides a wire-core-free strong magnetic linear motor, and particularly relates to a linear traction motor. According to the linear motor, two rectangular spiral lines with opposite rotating directions are processed in the surface of each of 2N rectangular copper plates or aluminum plates with the same length and width sizes in penetrating and electromechanical processing manners, every two of 2N processed rectangular spiral line plates are taken as a group, are correspondingly stacked with the rectangular spiral lines having opposite rotating directions and are insulated and fixedly sealed by epoxy resin adhesives to form an up-down structure, and the centers of the upper and lower rectangular spiral line plates are riveted, so that the rectangular spiral line plates of the upper plate and the lower plate are communicated to form a conductive passage; every two of the 2N rectangular spiral line plates are stacked, accordingly, N groups of electromagnetic plates are formed, are glued sequentially with adjacent electromagnetic plates in the opposite rotating directions and are fixed on a linear guide rail, and a rotor is inserted from the head part of the linear guide rail and can move along the rail; an enamelled wire is replaced with the electromagnetic plates, forming and wiring procedures of the enamelled wire are omitted, and the manufacturing process of the linear motor is simpler.