Disclosed is a portable electroacoustic device. The device includes a shell having a receiving space; a fixing part received in the receiving part and connected with the shell, and a vibrating unit positioned in the receiving space. The vibrating unit includes a vibrating system and a magnetic circuit system fixed with the fixing part for driving the vibrating system. The magnetic circuit system has a magnetic gap. The vibrating system includes a vibrating plate for driving an external medium to generate resonate, and a voice coil inserted in the magnetic gap for driving the vibrating plate. The shell includes a lower plate having a through hole, the vibrating plate connects with the lower plate and is accommodated in the through hole.