An electric plug type fragrance liquid heating and diffusing device includes an aroma bottle with a carrier having capillary pores for absorbing an aroma liquid, and a heater for heating the aroma liquid in the capillary pores of the carrier to dissipate the aromatic molecules into the outside air. When the aroma liquid is used up, the aroma bottle can be easily and rapidly detached for replacement. The aroma liquid absorbed by the carrier will not flow out of the carrier even if the aroma bottle is tilted or dumped during use or movement, ensuring safe use.