Provided is a movable machine tail of a walking aid. The movable machine tail of the walking aid overcomes the defects that in the process of overhauling, the workload is quite high, and an auxiliary tool is needed. The movable machine tail of the walking aid is characterized in that two rope guiding wheels are installed on one side of a rack, one of the rope guiding wheels is installed in a middle transverse beam, two rope tensioning wheels are installed on the middle transverse beam, one of the rope tensioning wheels is fixed to the middle transverse beam, the other rope tensioning wheel and the rope guiding wheels are connected together, the other rope tensioning wheel can slide in the middle transverse beam, a rope tensioning wheel is installed on one side, close to a rear vertical beam, of a lower transverse beam, a riding wheel is installed at the top end of the rear vertical beam, a balance weight is arranged at the tail end of a steel wire rope B, the steel wire rope B surrounds the riding wheel and the three rope tensioning wheels in sequence, and is finally wound on a turbine winding drum, and the turbine winding drum is fixed to the rear end of a rack base. The movable machine tail of the walking aid has the advantages that the whole machine tail can move through support of idler wheels of the lower transverse beam of the rack, and the purpose of stepless rope tensioning of the walking aid is achieved; the workload of daily maintenance is reduced, and the operation of loosening or tensioning the steel wire rope of the walking aid can be accomplished through only one person.