Present invention relates to a width adjustable and temperature controllable transverse direction magnetic flux induction heating apparatus. It contains belt material, fixed coil, mobile loop, yoke iron, guide way, travel mechanism, tank shape structure, fixed structure, and supporting rack, wherein fixed coil parallel to belt material surface, fixed coil long edge perpendicular to belt material direction of motion, removable loop parallel to belt material surface and located fixed coil outside it long edge parallel to belt material direction of motion mobile fixation to supporting rack, interior fixing several groove shape structure, yoke iron inserted in groove and fixed by fixing structure, each traveling loop can sliding in two ends guide way, supporting rack. Present invention is width and temperature controllable, can adapt belt material width variation in larger range and get more uniform temperature distribution, greatly raise production efficiency and save cost.