The utility model relates to a cable protection device especially relates to a cable protection pipe mouth of pipe supporting device. A cable protection pipe mouth of pipe supporting device, include by the bearing hoarding around the supporting device body, bearing circle, buckler, the support bracket that form, supporting device body lower extreme be provided with the draw -in groove, supportingdevice body upper end limited bit slice of edge connection and solid fixed ring, the bearing circle links to each other with solid fixed ring's outer end, the buckler cooperatees with the bearing circle, support bracket upper end be provided with bearing plate, bearing plate insert in the draw -in groove of supporting device body lower extreme and with the draw -in groove joint. The utility modeldiscloses can manage mouth of pipe fireproof blocking material by simple and easy effectual bearing cable protection, and have beneficial effect such as waterproof, that the installation dismantlementis convenient.