Floating wheel of walking aid

The utility model provides a floating wheel of a walking aid, which comprises a first trundle and a second trundle which are respectively arranged on two sides of a trundle supporting tube of the walking aid, and two ends of a mandrel are respectively connected with the two trundle through bearings. A fixed base is fixedly connected to a preset position in an inner cavity of the trundle supporting pipe, a floating base is further arranged in the inner cavity of the trundle supporting pipe and connected with the fixed base through a spring, a through hole is further formed in the floating base, and the through hole is matched with a mandrel for use, so that the mandrel can penetrate through the through hole but cannot rotate relative to the floating base. A first long round hole and a second long round hole which are formed in the vertical direction are formed in the two opposite pipe walls of the trundle supporting pipe respectively, and the mandrel sequentially penetrates through the first long round hole, t