Waveguide direct-feed-type microwave plasma torch device

The invention provides a waveguide direct-feed-type microwave plasma torch device which comprises a waveguide portion, a tuning and auxiliary portion and a coaxial torch tube portion. The waveguide portion comprises a gradual-changing-type waveguide and a narrow-edge compression waveguide. The coaxial torch tube portion comprises an outer tube, a middle tube, an inner tube, a regulating stud and a coaxial centering washer. The tuning and auxiliary portion comprises a waveguide short-circuit sliding end, a torch tube reflection tuning end and a torch tube upper portion regulating end. The waveguide short-circuit sliding end comprises a waveguide short-circuit plate and a sliding rod. The torch tube reflection tuning end comprises the regulating stud and a reflection plate. The gradual-changing-type waveguide and the narrow-edge compression waveguide are directly fed into the metal coaxial torch tube, a formed plasma has a central channel so that a sample can be conveniently led into the plasma, and meanwhile bearing capacity for the sample is intensified. The device eliminates a coaxial cable, a coupling ring and the like, improves coupling efficiency, and expands the use power of the torch tube. The device can be used as an ionization source of an atomizer and an ionization source of an atom mass spectrum or used for decomposition and treatment of harmful chemicals and rubbish.