The present invention discloses a protective cover plate for a flat plug and the flat plug with the same. A limit slot is arranged on a cover plate body of the protective cover plate and is configured to be sheathed outside the flat plug and to limit the flat plug, so that the flat plug is located in a protective space of the cover plate body. The flat plug can be inserted into or pulled from a plugboard by operating the protective cover plate. The flat plug is used in cooperation with the protective cover plate, and a positioning insert matched with the limit slot is arranged on the flat plug, thereby improving the safety of use.