The invention relates to a microwave and plasma interacting device in magnetic plasma, in particular to a microwave and plasma interacting device in magnetic plasma under the condition that a magnetic field and an electric field are perpendicular. The microwave and plasma interacting device aims to solve the problem that no microwave and plasma interacting device under the characteristic situation of the different magnetic plasma exists in the prior art. The microwave and plasma interacting device comprises a microwave generator, a ferrite isolator, an attenuator, a directional coupler, a waveguide tube, an insulation microwave window, a vacuum cavity, a plurality of solenoids, a diaphragm, a plasma source, two Langmuir probes, a cut-off tube, a matching microwave load, a loop antenna, a magnetic probe, an electrostatic probe, a multiple-grid probe and a plasma visualizer, wherein the plasma source is a sparking plasma source, generated sparking voltage is used for controlling the density of the plasma, and the attenuator is used for adjusting microwave power. The microwave and plasma interacting device is used for researching the interaction between the microwave and the plasma under the characteristic condition of the different magnetic plasma.