The invention provides a vertical type pneumatic rotary self-excitation waste gas purification apparatus. A waste gas purification apparatus body is tangentially connected with a flue gas inlet pipeline, a pneumatic rotary self-excitation rotor is arranged inside the waste gas purification apparatus body, a demister is arranged at the upper part of an inner barrel, and the top part of the inner barrel is connected with a purified gas outlet pipeline. According to the vertical type pneumatic rotary self-excitation waste gas purification apparatus adopting the technical scheme, the force of flue gas from a tangential inlet pushes the rotor to rotate, a rotary self-excitation blade stirs fluid to generate self-excitation foams, and liquid flow impacts the fitting surface of a cobblestone when reaching a foam self-excitation zone, so that the self-excitation effect is improved, and harmful gas in flue gas can be completely absorbed into a liquid phase and is oxidized under the irradiation of ultraviolet light for achieving the purpose of removing harmful substances in flue gas. The waste gas purification apparatus can treat different kinds of waste gases (such as flue gas containing SO2, NOx, Hg and other harmful substances), and has the characteristics of simple structure, low energy consumption, convenience for operation, wide adaptability, good removing effect and the like.