The invention relates to an ultra-long winder, which comprises a frame, and a coil positioning mechanism, a coil correcting mechanism, a coil winding mechanism and a driving mechanism matched with the coil winding mechanism, which are arranged on the frame. The coil positioning mechanism comprises a plurality of groups of positioning set rollers and correcting set rollers. Through the structure of the positioning set rollers and the correcting set rollers and a mutual arrangement relationship, the offset problem of the coil is effectively solved. Meanwhile, due to a roller taking-out component, a driving clutch mechanism, and a driving tension removing mechanism matched with the driving clutch mechanism in the coil winding mechanism, the problem brought by inconsistency between the production line speed and the coil winding speed in the process of winding large coils and the problem for extracting a winding shaft and a paper tube after the winding of the large coils can be well solved. Through the control of a PLC controller and an encoder in a control circuit, the function of precisely measuring the winding length also can be realized in the process of winding the large coils.