Treadmill and composite stair-climbing machine switching construction

The utility model discloses a running machine and stair-climbing machine switching device, which consists of an external rack and a machine body. The external bracket is equipped with armrests, and the machine body consists of a computer starting mechanism, a rotating mechanism and inclined adjustment mechanism; the rotating mechanism is equipped with a running circulation belt at outer edge. The device is characterized in that unit plates with roller wheels can be formed at bottom of the running circulation belt by adjusting ascending and descending; when the unit plates are higher than unit plates of adjacent side, the two types of unit plates form a ladder structure; the switching device is used to achieve switching between a running machine and a stair climbing machine.