A volatile substances evaporation device comprises a body (1) which can house an element (2) impregnated with volatile substances an electric resistance (4) and a plug (5) for connection to a power grid and said electrical resistance (4) is positioned in said plug (5) and said plug (5) is movable with respect to said body (1) so that the distance between the element (2) and said electrical resistance (4) is variable, defining at least one position of maximum evaporation and one position of minimum evaporation.
