The invention discloses a full-automatic system used for winding copper wires on transformer bobbins and having a prewinding function. The system comprises a machine frame, a winding device, a cutting device and a charging and discharging device; the machine frame comprises a rack, a fixing frame, an underframe and a turning rod; the winding device comprises a winding fixed plate, a plurality of winding sticks, a plurality of fixed bases and a plurality of sleeves; the cutting device comprises a cutting fixed plate, a plurality of cutting bases, cutting columns and head caps; the charging and discharging device comprises a discharging plate, a plurality of discharging frames, a plurality of discharging frame fixing bases and sliding slopes. The system has the beneficial effects that the copper wire winding operation of the transformer bobbins can be finished in a completely mechanical mode; the copper wire winding effect is excellent, the production efficiency is high, actions are accurate, the finished transformer bobbin products are high in quality; time and material cost can be saved due to efficient operation; therefore the system can create high benefit and is suitable for popularization.