The invention relates to a shielding separable straight connector used in the power distribution of a switch cabinet. An upper port of a straight outer casing of the connector is an inner conical surface, the middle part thereof is provided with a branch which is provided with a side opening taking the shape of an internal taper, and a lower port thereof takes the shape of a cylinder; the outer surface of the straight outer casing is grounded by a lead through a grounding hole; the lower end of a lug is connected with a cable core through a compression joint, and the upper end thereof is tightly pressed between the lower end surface of a conductive metal part and a gasket, and fixed by a two-start worm II and corresponding bolts; the upper end surface of the conductive metal part is tightly pressed on a metal part of the casing end surface, and fixed by a two-start worm I and corresponding bolts, and the lower end thereof is connected with the lug; a plug is inserted into the internaltaper of the side opening of the straight connector, the front end of the straight connector is tightly screwed and fixed at the end of the two-start worm II by screw thread, and the rear end thereofis covered by a conductive protecting cap. Through the technical proposal, the connector can have the advantages of reasonable structure, compact combination of each level, convenient installation, high reliability and expanding function.