The utility model relates to a device directly producing ozone from liquid. The utility model is composed of an ultraviolet source, a gas source, a gas transmission pipeline, a gas distributing head, etc. The gas distributing head can produce bubbles in the liquid, and the gas containing oxygen in the bubbles produces the ozone after ultraviolet irradiation. The ozone dissolves in the water to perform the disinfecting effect. The device has the advantages of simple structure, convenient operation and high disinfecting efficiency, can directly produce the ozone for disinfecting in any water storage container and can be used for disinfecting the drinking water in the field or the epidemic-stricken area.