The invention discloses a winding-unwinding type key cylinder, and belongs to the technical field of office supplies. The winding-unwinding type key cylinder is composed of a key cylinder body (1), a key shaft (2), end covers (3), spiral springs (4), key rings (5) and key ropes (6). The end covers (3) with shaft holes in the centers are arranged at the two ends of the key cylinder body (1) respectively, and the key shaft (2) is installed in the shaft holes. The inner ends of the spiral springs (4) are fixed to the key shaft (2), and the outer ends of the spiral springs (4) are fixed to the inner wall of the key cylinder. The key ropes (6) are wound around the key shaft (2) and extend outwards to penetrate out of holes in the key cylinder body (1), the key rings (5) are arranged at the tail ends of the key ropes (6), and keys can be bunched to the key rings (5). When the key ropes (6) are pulled out, the spiral springs (4) are tightly wound; when the key ropes (6) are released, the spiral springs (4) are expanded through elastic force of the spiral springs (4), and the key shaft (2) is rotated to pull the key ropes (6) back. The sequentially-arranged keys are bunched to the key rings (5) at the ends of the key ropes (6). The required keys are pulled out and automatically withdrawn after being released. At ordinary times, the set of related keys are simply gathered together in order, and the required keys are pulled out in use. Storage, identification and use are convenient, and the winding-unwinding type key cylinder is used for storing a set of related keys.