A volatile substance evaporation device includes a constant evaporation chamber (2) housing a liquid with volatile substances, an enhanced evaporation chamber (3) and an evaporation membrane (5) through which the volatile substances evaporate. The enhanced evaporation chamber (3) includes an absorbent body (6) therein. The inclusion of the absorbent body (6) enhances the evaporation rate in a simple manner and allows the enhanced evaporation to be substantially constant.