The invention discloses a copper water stop seal forming device. The copper water stop seal forming device comprises a frame, a feeding platform, a rolling device and a driving device, wherein the feeding platform, the rolling device and the driving device are all mounted on the frame; the rolling device comprises a pre-pressing rolling component and a forming rolling component; the feeding platform, the pre-pressing rolling component and the forming rolling component are sequentially arranged in the feeding direction of the copper water stop seal forming device; the pre-pressing rolling component is used for pressing the middle of a copper water stop seal; the forming rolling component is used for pressing the middle and two flanges of the copper water stop seal. The copper water stop seal forming device has the advantages of compact structure, safety, reliability, high production efficiency, good product quality and the like.