Disclosed is a fumigation vaporizer capable of quickly vaporizing a fumigant, which is widely used in agriculture or quarantine to control insects or weeds, thereby safely and effectively carrying out fumigation, as compared to a conventional process. The fumigation vaporizer includes a housing, a fumigant supply pipe, a heater, a non-explosive gas supply member, a gas supply pipe, a vessel-type heater, a gas discharge pipe, and a controller. The housing is provided with a heating hollow portion at the lower portion of the inner cavity, in which the non-explosive gas heated and supplied by the vessel-type heater heats a bottom surface of the inner cavity while passing through the heating hollow portion. A bottom surface of the heating hollow portion is provided with an inlet port through which the non-explosive gas passes, and a top surface of the heating hollow portion opposite to the inlet portion is provided with an outlet port through which the non-explosive gas passing the heating hollow portion is supplied to the gas discharge pipe installed to the inner cavity.
