NOVELTY - The device comprises a filter, a nitride reactor, an ammonia decomposition device, two purifiers, a booster pump and a high pure ammonia synthesis device. The filter is connected with an ammonia decomposing device through a first pipeline. The ammonia decomposing device is connected with the first purifier through a second pipeline. The second purifier is connected with the first purifier through the third pipeline. The booster pump is connected with high purity ammonia synthesis device through a fourth pipeline and fifth pipeline. . The nitride reactor is connected with the filter.    USE - The device is useful for reproducing high pure ammonia in an electronic industry (claimed).    ADVANTAGE - The device safely and economically reproduces high pure ammonia with less energy consumption and good stability in an eco-friendly manner.    DETAILED DESCRIPTION - The device comprises a filter, a nitride reactor, an ammonia decomposition device, two purifiers, a booster pump, a tail gas storage tank and a high pure ammonia synthesis device. The filter is connected with an ammonia decomposing device through a first pipeline. The ammonia decomposing device is connected with the first purifier through a second pipeline. The second purifier is connected with the first purifier through the third pipeline. The booster pump is connected with high purity ammonia synthesis device through a fourth pipeline and fifth pipeline. The nitride reactor is connected with the filter through a sixth pipeline and high pure ammonia synthesis device through a seventh pipeline. An upper part of the booster pump and the second purifier are connected with a hydrogen nitrogen buffer tank and a first hydrogen-nitrogen ratio monitoring device. The second purifier and the high purity ammonia synthesis device are connected with a second hydrogen gas ratio adjusting device through the fifth pipeline. The second hydrogen nitrogen ratio adjusting device is connected with a third purifier through the fifth pipeline. The tail gas storage tank is connected with the nitride reactor. The filter is connected with a high-purity ammonia storage tank through the seventh pipeline. The ammonia decomposing device comprises a gas pipe, a first heat exchanger, an ammonia decomposition furnace, a water cooler, a fourth purifier and a hydrogen nitrogen mixed gas discharge pipe. The first heat exchanger is divided into a horizontal channel and a vertical channel. A gas input tube of the first heat exchanger is connected with an inlet end of the horizontal channel. An outlet end of the horizontal channel is connected with a branch pipeline and an inlet end of the ammonia decomposing furnace. An outlet end of the ammonia decomposing furnace is connected with an outlet end of the vertical channel that is connected with a second branch pipe. The fourth purifier comprises a first purification regeneration channel that is provided with a molecular sieve. An outlet end of the water cooler is connected with an outlet end of the purification regeneration channel. A third branch pipeline is connected to the hydrogen-nitrogen mixed gas discharge pipe through a fourth branch pipeline. An inlet end of the first purification regeneration channel is connected with an inlet end of a second heat exchanger and a first regenerated tail gas discharge pipe. The first and second heat exchangers and an outer wall of the ammonia decomposing furnace are covered with a heat insulating temperature-preserving layer. The third branch pipeline is connected in parallel with a fifth branch pipeline. The third branch pipe is provided with a first valve. The fourth branch pipeline is provided with a second valve. The fifth branch pipeline is provided with a third valve. A sixth branch pipeline of the device is provided with a fourth valve. A first tail gas exhaust pipe is provided with a fifth valve. An outlet end of a first heat channel is connected with an inlet end of a seventh branch pipeline and the water cooler. The seventh branch pipeline is provided with a sixth valve that passes through an eighth branch pipeline and an inlet end of a first heat channel. The fourth purifier is provided with multiple tubes. An outer wall of the fourth purifier is covered with an insulating isolation layer. The ammonia decomposition furnace comprises a fifth purifier that is provided with a second purification regeneration channel that is provided with a molecular sieve. An outlet end of the water cooler is connected with a ninth branch pipeline that is provided with a seventh valve. An outlet end of the second purification regeneration channel is connected with a gas discharge pipe through the tenth branch pipeline. The tenth branch pipeline is connected with an eighth valve through the ninth branch pipeline and an inlet end of the second purification regeneration channel. The tenth branch pipe is located in parallel with the eleventh branch pipe whose upper part is provided with the ninth valve. The inlet end of the second purification regeneration channel is connected with a second regenerated tail gas discharge pipe whose upper part is provided with a tenth valve. The device further comprises a second heat channel. The third branch pipe is connected with an inlet of the second heat channel through the seventh branch pipe and twelfth branch pipeline. An outlet end of the heat channel is connected with a thirteenth branch pipeline that is connected with an inlet end of the water cooler and provided with a eleventh valve. An INDEPENDENT CLAIM is included for a method for reproducing high pure ammonia in an electronic industry.