A removable insulating device for grooved rails of urban railway tracks, intended to insulate the grooved rail arranged in an urban track for insulation from external conditions, in which the grooved rail comprises: - a head side, and a grooved side, lateral and opposite each other, - a lower foot equipped with lateral wings, - a groove defined in an upper face of the grooved rail, and - screws perpendicular to the wings of the foot for fastening the grooved rail to a road surface, the removable insulating device comprising: - a head profile, linkable to the head side of the grooved rail, - a grooved profile, linkable to the grooved side of the grooved rail, and - a lower sheet intended to be arranged in a position below the foot of the grooved rail, wherein both the head profile and the grooved profile comprise a body with an essentially polygonal geometry that comprises: - an inner face intended to face the grooved rail, said inner face comprising a vertical flat area, - an outer face, intended to be oriented towards the outside of the grooved rail, out of which extends a protruding area intended to immobilize the profile (1,2) on the rail as well as to facilitate the vertical removal thereof characterized in that - the lower sheet is perpendicularly linked to the lower ends of the head profile and to the grooved profile, and in that the body of the head profile and the grooved profile of the removable insulating device comprises, - a longitudinal housing in the lower end of said vertical flat area, which can be coupled with the foot of the grooved rail, - flanges extending out form the vicinity of the upper end of said vertical flat area which can be coupled with the head side of the grooved rail in the case of the head profile, or with the grooved side of the grooved rail in the case of the grooved profile and - a cavity in the vertical flat area intended to house the heads of the screws for fastening the grooved rail to the road surface. - a head side, and a grooved side, lateral and opposite each other, - a lower foot equipped with lateral wings, - a groove defined in an upper face of the grooved rail, and - screws perpendicular to the wings of the foot for fastening the grooved rail to a road surface, - a head profile, linkable to the head side of the grooved rail, - a grooved profile, linkable to the grooved side of the grooved rail, and - a lower sheet intended to be arranged in a position below the foot of the grooved rail, - an inner face intended to face the grooved rail, said inner face comprising a vertical flat area, - an outer face, intended to be oriented towards the outside of the grooved rail, out of which extends a protruding area intended to immobilize the profile (1,2) on the rail as well as to facilitate the vertical removal thereof - the lower sheet is perpendicularly linked to the lower ends of the head profile and to the grooved profile, and in that the body of the head profile and the grooved profile of the removable insulating device comprises, - a longitudinal housing in the lower end of said vertical flat area, which can be coupled with the foot of the grooved rail, - flanges extending out form the vicinity of the upper end of said vertical flat area which can be coupled with the head side of the grooved rail in the case of the head profile, or with the grooved side of the grooved rail in the case of the grooved profile and - a cavity in the vertical flat area intended to house the heads of the screws for fastening the grooved rail to the road surface.