The invention discloses a
microwave vacuum air pressure
sintering furnace, which comprises a furnace body, wherein the furnace body is connected with a
vacuum pumping device and a pressurizing device, a heat insulation box body used for material
sintering and heat loss reduction is arranged in the furnace body, the furnace body is provided with a micro wave generator used for feeding microwaves into an inner cavity of the furnace body, the
microwave generator comprises a
microwave source used for giving out the microwaves and a wave guide used for feeding the microwaves generated by the microwave source into the furnace body, the number of the microwave generator is one, a
waveguide feed opening is formed in a direction towards the center of the heat insulation box body arranged in the furnace body, or the number of the microwave generators is several, the engaging directions of the microwave sources and the
waveguide are in mutually vertical arrangement in the two adjacent microwave generators, in addition, the feeding-in direction of the
waveguide engaged with the corresponding microwave sources deviates from the center of the heat insulation box, and the deviation distance of the feeding-in direction from the center of the heat insulation box is the odd
number times of the
wavelength of the microwaves. The uniform and fast
sintering of high-density components adopting complicated structures can be realized.