Provided in the present application are a connector, a connector assembly and an electronic device. The connector comprises a grounding conductive assembly and a lead frame. The grounding conductive assembly comprises a conductive housing and a first grounding terminal, wherein the conductive housing is provided with a first cavity and a second cavity; the conductive housing comprises a first end and a second end that are opposite each other in a first direction, and the first end of the conductive housing is used for connecting to a peer connector; and the first grounding terminal is arranged on the first end of the conductive housing and extends into the second cavity, and is electrically connected to the inner wall of the second cavity. The lead frame is arranged on the second end of the conductive housing, and the lead frame comprises a plurality of signal terminal groups and shielding layers that are respectively arranged on two sides of the plurality of signal terminal groups, wherein each signal terminal group comprises at least one signal terminal; the shielding layers are electrically connected to the conductive housing; and the signal terminal extends into the first cavity and is isolated from the inner wall of the first cavity. The first direction is the direction in which the connector is plugged into the peer connector. A grounding return path of the connector is significantly shortened, thereby increasing a transmission rate.