The invention discloses a copper strip winding device having a straightening function. The device comprises a base; supporting legs are fixedly mounted on two sides of the bottom of the base; a box body, a motor box and a support rod are fixedly mounted at the top of the base sequentially from left to right; a controller is fixedly mounted on the front surface of the box body; the top of the box body communicates with a ventilating pipe; through holes are formed in two sides of the box body; a first motor is fixedly mounted at the top of an inner cavity of the box body; a gear is fixedly mounted on an output shaft of the first motor; and supporting rods are symmetrically mounted on two sides of the bottom of the inner cavity of the box body. With the device, the effect of compacting and straightening a copper strip is realized through improvement of the box body, so that the copper strip is convenient to wind, meanwhile, the quality of the copper strip is guaranteed, use by a user is facilitated while the winding time is saved, the flatness of the copper strip is improved, and the machining efficiency of the copper strip is greatly improved.