A treble-bass coaxial loudspeaker has an inverted conical frame, a bass resonance assembly mounted to the bottom of the frame, a bracket, and a treble resonance assembly. The bracket is mounted on the bass resonance drumhead and contains the treble resonance assembly inside to separate the treble resonance chip from the bass resonance assembly below. In this way, when the bass resonance drumhead vibrates, the air turbulence between the bass resonance drumhead and the wave damping annular board decreases destruction of the joint strength between the treble resonance chip and the treble resonance drumhead.