The application relates to a connector housing, a connector housing assembly and a connector assembly. The connector housing has a housing body and a shroud. The housing body encloses an accommodating cavity. The shroud is disposed around and connected to the housing body. A gap is formed between the shroud and the housing body to form a slot. The connector housing is further provided with one of a lug or a sliding groove. The lug or the sliding groove is positioned in the slot. According to the connector housing assembly and the connector assembly in the application, the lugs are matched with the sliding grooves to guide the first connector housing and the second connector housing during plug-in connection, so as to avoid failure of installation in place due to relative deflection of them.