A resonance counterweight structure for audio effect article includes a hollow counterweight main body and an assembling section connected with the counterweight main body. The assembling section can be mounted in a predetermined position of a musical instrument. The counterweight main body at least includes an upper wall, a lower wall and a peripheral wall connected between the upper and lower walls. The upper wall, the lower wall and the peripheral wall define a chamber of the counterweight main body. At least one counterweight fine-adjustment unit is received in the chamber. The counterweight main body and the counterweight fine-adjustment unit help the audio effect article to modify the music so as to achieve more idealistic timbre effect. A player can more diversely select or replace the counterweight structure, whereby one single musical instrument can selectively output different timbre effects according to the requirements of different playing situations.