A heating assembly and a USB volatilizing device provided with the heating assembly. The USB volatilizing device comprises a base (1), a cover (2), a chemical solution bottle (3), and the heating assembly (4); the base (1) is provided thereon with a USB interface (12) which is connected to a wiring pin (432); the heating assembly (4) comprises a mounting base (41) and a mounting column (42); an accommodating groove (411) is provided between the mounting base (41) and the mounting column (42) and is provided therein with a heating element (43) which comprises a heating wire (431) and the wiring pin (432); the heating wire (431) is wound on the hollow mounting column (42) and has the inner wall being fitted on the mounting column (42); a gap (44) is presented between the outer wall of the heating wire (431) and the inner wall of the mounting base (41). The structure, provided together with a mosquito-repellent liquid or an aromatic liquid as one set, is directly driven to work by a direct current by being inser
