The utility model discloses a spiral key. The spiral key comprises a key head, a key handle and a connecting pin. The key head and the key handle are rotatably connected. The key head is of a hollow structure and comprises a spiral section with a thread structure and a mounting section which is connected with the spiral section. A hole groove is formed in the inner surface of the spiral section, and a limiting groove is formed in the end, far away from the spiral section, of the mounting section. The connecting pin comprises an inserting section and a clamping section which is connected with the inserting section, a limiting part is arranged on the outer surface, close to the clamping section, of the inserting section, and the connecting pin is mounted in the key head. The limiting part is clamped on the limiting groove and can move up and down along the limiting groove. The key handle comprises a mounting hole and a clamping hole which is communicated with the mounting hole, a first elastic piece is arranged in the clamping hole, and the mounting section is arranged in the mounting hole. The key head has a free state and a clamping state relative to the key handle. The utility model further provides a lock.