The invention discloses a high-safety treadmill, which comprises a base and a running seat, wherein a supporting plate is arranged at the upper end of a supporting pillar; a supporting device is arranged at the lower side of the supporting plate; a connecting belt is arranged at the lower end of the supporting device; a body fixing device is arranged at the lower end of the connecting belt; a supporting pillar is arranged on the left part of the upper side of the base; the upper end of the supporting pillar is connected to the running seat via a connecting seat; a second electric telescopic rod is arranged on the right part of the upper side of the base; a sliding groove is formed in the right part of the lower side of the running seat; a sliding block is arranged in the sliding groove; the lower end of the sliding block is connected to the upper end of the second electric telescopic rod via the connecting seat; a running belt is arranged at the upper side of the running seat; a plurality of convex blocks are uniformly distributed at the upper side of the running belt; cavities are laterally symmetrically arranged in the lower side of the base; fixed boxes are arranged in the cavities; and a suction disc is arranged at the lower end of the fixed box. The high-safety treadmill provided by the invention is simple in structure, convenient to use, high in safety and stable to place; and in addition, various running gestures can be adjusted, so that strong practicability is guaranteed.