A liquid atomizer includes a main body and an ampoule holder detachably attached to the main body for holding ampoules in an annular formation. The main body has an atomizing part for atomizing the liquid discharged from outlets of the ampoules. The outlet of each of these ampoules can be disposed proximal to the atomizing part by moving the ampoules around the annular formation. Positioning devices are between the main body and the ampoule holder for positioning the ampoule holder properly with respect to the main body. The ampoule holder holds the ampoules such that each of the ampoules can move between an advanced position and a retracted position. The outlet of each ampoule moves into the atomizing part when the ampoule moves to the advanced position. The ampoule holder is able to undergo a rotary motion with respect to the main body when each of the ampoules is at the retracted position.