An ozone faucet contains a body and a mixer. The body includes an outlet end and an ozone tube, and the outlet end has inner threads for screwing with a casing, between the casing and the outlet end is defined an accommodating space. The mixer includes a water guiding member, a resilient element, and a check tube. The water guiding member has a groove and a plurality of increasingly conical orifices, the resilient element is accommodated in the groove and has a stopping plug pushed by the resilient element. The check tube has a disc covering the water guiding member, the disc has a plurality of decreasingly conical apertures matching with the plurality of increasingly conical orifices The check tube also has a channel passing therethrough and contacting with the stopping plug, the mixer is secured in the accommodating space, and the check tube connects with the ozone tube.