This invention provides a nebulizer without restriction of using direction comprising a first tube body, a second body disposed in the first tube body and a screen structure disposed on the end of the first tube body. In addition, an upper channel, a side channel and a lower channel are formed between the first tube body and the second tube body, and an upper channel, a side channel and a lower channel are formed between the first tube body and the periphery of the second tube body, such that when the nebulizer is used, capillary force is generated on the side channel so that liquid in the second tube body can be sent to the screen structure sequentially through the lower channel, and further an annular vibratory source is then caused to vibrate the screen structure to atomize the liquid and spread it into the air.一種無使用方向限制之霧化器，係包括第一管體、設於該第一管體內之第二管體及設於該第一管體端部上之篩結構，並於該第一管體內與該第二管體周圍之間形成上通道、側通道及下通道，以於使用該霧化器時，該側通道會產生毛細作用力，使該第二管體內之液體可依序經由該下通道、側通道及上通道輸送至該篩結構，再令環形震動源震動該篩結構，以將該液體霧化而散布至空氣中。
