The invention discloses a portable X-ray imaging device for quality testing of conductor compression jointing. The device comprises a portable pulse X-ray machine, a digital flat panel detector, a foldable pvc bracket and an upper computer provided with image defect automatic interactive recognition software, wherein a compression jointing conductor to be subjected to quality testing is arranged on the foldable pvc bracket, the digital flat panel detector is arranged vertical to the horizon, the foldable pvc bracket is arranged in front of a detection panel of the digital flat panel detector,and the portable pulse X-ray machine successively irradiates to the compression jointing conductor to be subjected to quality testing and the detection panel; and the signal output end of the digitalflat panel detector is connected to the upper computer. The portable X-ray imaging device disclosed by the invention can be used for detecting the conductor compression jointing quality nondestructively, displaying the compression jointing condition of the conductor clearly by means of digital ray imaging equipment, and improving the quality testing accuracy without damaging a cable clamp, can besuitable for the demand of field construction, can examine relative positions of an aluminum wire, a steel core, the cable clamp and a steel anchor conveniently, and can reflect the compression jointing quality correctly.