Waveguide coaxial converter

The invention discloses a waveguide coaxial converter. The waveguide coaxial converter comprises an interface port, a circular waveguide stepped cavity butt jointing body, a stepped matching cavity, a microstrip substrate, an electromagnetic sealing end cover and a radio frequency connector, wherein the interface port, the circular waveguide stepped cavity butt jointing body, the stepped matching cavity, the microstrip substrate and the electromagnetic sealing end cover are in butt jointing step by step; the radio frequency connector is mounted on the outer side walls of the electromagnetic sealing end cover and the stepped matching cavity; the stepped matching cavity is in integrated design, and has a multi-order rectangular stepped cavity; the butt jointing between the circular waveguide stepped cavity butt jointing body and the stepped matching cavity is seamless embedding connection; the butt jointing between the stepped matching cavity and the electromagnetic sealing end cover is seamless connection; and