Insulation support for contact rail

The utility model relates to the technical field of city rail transportation overhead line system power supply, in particular to an insulation support for a contact rail. The insulation support comprises a base, an insulation bracket, a beam, an upright shaft, an upright shaft roller, a horizontal shaft, and a horizontal shaft roller, wherein the insulation bracket is arranged on the base, the beam is arranged on the insulation bracket, a contact rail sliding chute is formed by enclosing of the insulation bracket and the beam, the horizontal shaft and the upright shaft are arranged in the contact rail sliding chute, the horizontal shaft roller is arranged on the horizontal shaft, the upright shaft roller is arranged on the upright shaft, and the contact rail is arranged in the contact rail sliding chute. When temperature changes, the contact rail stretches out and draws back in rolling mode on the horizontal shaft roller and the upright shaft roller which contact with the contact rail so that normal stretch a