A thin loudspeaker device includes a housing, a battery, and a loudspeaker module. The battery and the loudspeaker module are located in the housing. The loudspeaker module includes an inner shell, two loudspeaker units, and a block wall. The two loudspeaker units are located in the inner shell. The two loudspeaker units are electrically connected to the battery. The block wall is located between the two loudspeaker units. The inner shell and the block wall jointly form two chambers and a channel. The channel is communicated with the two chambers. The two loudspeaker units are respectively located in the two chambers.