The invention provides an electromagnetic heat-radiation coal bed permeability improvement drill rod device and a using method thereof. The electromagnetic heat-radiation coal bed permeability improvement drill rod device comprises a hollow drill rod and at least one electromagnetic wave generation device arranged on the drill rod. Sieve holes are formed in the position, close to the electromagnetic wave generation device, of the drill rod. A water inflow channel and a water outflow channel are formed in the drill rod. The electromagnetic wave generation device comprises a shell. A cathode filament is arranged in the center of the interior of the shell. An anode resonant cavity is formed in the periphery of the cathode filament in a surrounding mode. Electromagnets are arranged at the upper end and the lower end of the anode resonant cavity correspondingly. A waveguide tube is arranged in the middle of the periphery of the anode resonant cavity in a surrounding mode. Cooling cavities are formed in the upper side and the lower side of the waveguide tube. The bottoms of the cooling cavities are connected to the water inflow channel and the water outflow channel. A transmitting hole is formed in the periphery of the anode resonant cavity in the radial direction. One end of the transmitting hole is connected to the anode resonant cavity, and the other end of the transmitting hole penetrates through the waveguide tube and the shell to communicate with the outside. A transmitting antenna is arranged in the transmitting hole. A coal bed is heated through electromagnetic waves emitted by the electromagnetic wave generation device, so that the permeability of the coal bed is improved, and gas extraction is promoted.