The present invention relates to the field of electrical connectors, and in particular to a differential connector and a housing component thereof. The differential connector comprises a housing component and two or more differential modules. Each differential module comprises an insulator, differential pairs and ground contacts. The housing component comprises a housing. A plugging hole corresponding to a plug-in end of the differential pair is provided on the housing. An end shield corresponding to the plug-in end of the differential pair is provided on the housing. The end shield is provided with a shield groove extending along a plugging direction of the plug-in end of the differential pair. Openings of shield grooves face toward the same direction. The plug-in end of the differential pair is provided in the shield groove so as to be isolated from a plug-in end of an adjacent differential pair of the same differential module.