The invention relates to the field of a connector, and especially relates to a connector and a connector assembly. The connector comprises a connector housing extending along a front-back direction, the connector housing is provided with elastic pawls, the electric connector housing is provided with unlocking arms which extend inwards and can be close to the inside of the connector housing, and the unlocking arms and the elastic pawls cooperate through at least one wedge-shaped structure or arc-shaped structure arranged therebetween so as to enable the elastic pawls to be tilted and move away from hooking positions when the unlocking arms are close to the inside of an unlocking cap. When the unlocking arms are close to the inside of the unlocking cap, the front ends of the unlocking arms cooperate with the elastic pawls of the connector through the wedge-shaped structure or the arc-shaped structure, and the elastic pawls can be enabled to be tilted and move away from the hooking positions, such that unlocking of the connector can be realized through the unlocking arms, the elastic pawls do not have to extend along an insertion direction so as to form a "lever" structure, and the problem of large dimension of the connector in the insertion direction is solved.