A wire end connector and a connector assembly are provided. The wire end connector comprises a wire end housing and an unlocking member. The wire end housing comprises a wire end accommodating part and a retaining notch. The unlocking member comprises two opposite unlocking arms an activation piece and a buckling connecting piece. The two unlocking arms being movably disposed in the wire end housing, one end of the buckling connecting piece is connected to the two unlocking arms and disposed in the retaining notch, another end of the buckling connecting piece is connected to the activation piece.