The invention discloses safe stair handrails. Each stair handrail is internally provided with a chain transmission chamber; the chain transmission chamber is internally provided with a rotatable chain; the rotatable chain includes 4-6 T-shaped connection hooks; each stair handrail internally includes a T-shaped sliding block sliding groove communicating with the chain transmission chamber; two ends of each stair handrail are provided with a clamping groove communicating with the sliding block sliding groove respectively; the sliding block sliding groove includes a safe sliding block and a cargo sliding block which slide in the sliding block sliding groove and are connected to the connection hooks of the chain; the safe sliding block is provided with a semi-circular safe support rod; a handrail joint is internally provided with a joint inner chamber corresponding to the sliding block sliding groove; and the joint inner chamber includes two lines of rolling wheels for allowing the safe sliding block and the cargo sliding block to pass. The safe stair handrails are simple in structure, are easy to operate, and can protect a man climbing stairs during a process of stair climbing.