The invention relates to a range hood capable of purifying, mainly comprising a smoke detector, a high-pressure carbonizing net arranged in an air flue, a high-temperature carbonizing net, an atomizing device, a dust filtering net and a fan, wherein all the parts are controlled through a control chip; and the air flue is further and internally provided with a water discharging opening communicated with the outside. Compared with the prior art, the invention provides an automatically-operated range hood capable of purifying, which can carbonize lampblack entering the air flue, and discharges the lampblack after spraying and washing, so that the range hood capable of purifying has a good purifying effect, avoids the deposition of the lampblack in the air flue, completely realizes the washing-free range hood, has good purifying and air exhausting effects, and is automatic and energy-saving.