The invention discloses a loudspeaker assembly and a mobile terminal. The loudspeaker assembly comprises a housing, a loudspeaker arranged in the housing, and a first circuit board arranged in the housing. The first circuit board comprises a first exposed copper layer arranged on the front end face of the first circuit board. The loudspeaker comprises magnet steel arranged on the rear end face of the loudspeaker shell, and the rear end of the magnet steel is arranged in a convex shape. A second circuit board is arranged on the rear end face of the magnet steel at the two sides of the protruding portion of the rear end of the magnet steel. The second circuit board comprises a second exposed copper layer arranged on the rear end face. The second exposed copper layer and the first exposed copper layer are clamped between the rear end face of the second circuit board and the front end face of the first circuit board. According to the embodiment of the invention, a conductive elastic part is cancelled, and the second exposed copper layer and the first exposed copper layer are directly used to connect the first circuit board and the loudspeaker. Thus, the thickness of the sound cavity structure of the loudspeaker and the thickness of the whole mobile terminal are reduced, and the development demand for mobile terminal miniaturization is satisfied.