Abstract: Provided are a floating ball structure and a humidifier. The floating ball body is connected to the floating ball stem, a part of the first insert is disposed in the receiving cavity, another part of the first insert extends through the first through-hole, a part of the second insert is disposed in the receiving cavity, another part of the second insert extends through the second through-hole and protrudes from the floating ball stem, at least one of the first insert or the second insert is able to slide relative to the floating ball stem in a first direction, at least one of the first insert or the second insert has a drive block, the drive block extends through the third through-hole and protrudes from the floating ball stem, and the drive block is able to drive the first insert or the second insert to move in the first direction.