The invention discloses an audio playing device and a mobile terminal. The audio playing device comprises at least two loudspeakers, wherein sound waves sent by each loudspeaker are coherent waves, a phase difference of the sound waves which are sent by any two loudspeakers and arrive at a first target region is an integer multiple of 2pi, and the phase difference of the sound waves arriving at a second target region is an odd number of pi. Therefore, the coherent phase of the sound waves sent by the loudspeakers in the first target region is long, the sounding power of each loudspeaker is superimposed efficiently, the loudness of the sound in the target region is improved, the sound effect of the region is enhanced greatly, consequently, the peak power of single loudspeaker can be reduced, the user experience is improved, and the energy is saved. The coherence of the sound waves sent by the loudspeakers is cancelled in the second target region, so that the sound in the target region is suppressed, directional propagation of the sound is realized, avoiding of accidental leakage of information is benefited, privacy of a user is protected, and meanwhile other persons are also prevented from being disturbed.