Provided therein is an apparatus of a volatilizer for phytoncide air, which is a replaceable and exchangeable cartridge type volatilizer, which has an exchange sensor to sense whether or not Hinoki cypress diluted essential oil exists in a reservoir and to let a user know time to replace or exchange the reservoir, and which has slope plates mounted inside the reservoir to make the Hinoki cypress diluted essential oil, which fills the reservoir, go close to and concentrate on an air inlet. The volatilizer for phytoncide air includes: a reservoir having a charging space which is filled with a Hinoki cypress diluted essential oil slope plates disposed in the charging space of the reservoir an air inlet and an air outlet respectively formed at an upper portion of the reservoir and an exchange sensor disposed at a lower portion of the reservoir and connected with a warning light.
