Steel rolling production line detection device protection device

The utility model discloses a steel rolling production line detection device protection device, which comprises a hot metal detector and a protection cover, the hot metal detector is detachably arranged in the protection cover, a cooling circulation coil pipe is arranged in an interlayer of the inner wall of the protection cover, and the protection cover is sleeved outside the hot metal detector close to a detection end. And the bottom of the protective cover is fixedly connected with a telescopic rod. When in use, the hot metal detector is mounted in the protective cover, the hot metal detector can be protected through the protective cover, and the detector is not easy to damage when the phenomena of water pipe explosion, oil pipe explosion and the like occur, so that the overall service life of the detector is prolonged; meanwhile, the cooling circulation coil pipe is additionally arranged in the protective cover, cold water is discharged into the cooling circulation coil pipe through the cooling water disc