A plug-in fragrance dispenser contains: a body, an electric plug, a heating element, a thermal transfer element, and a holder. The electric plug is electrically connected with a power source, and the body is coupled with the electric plug and includes a first orifice, a first connection part, and a second connection part. The first connection part is connected with the second connection part, the first connection part has an accommodation lid and a surround sleeve, and the surround sleeve has the first orifice defined on a top thereof. The accommodation lid has a second orifice in which the electric plug is accommodated, the second connection part has a support seat and a first cap formed on an upper end of the support seat and connecting with a bottom of the surround sleeve, wherein the support seat is housed in the accommodation lid.
