The invention discloses a protective gas nanobubble generation device, which comprises a pressure container, an atomization nozzle, a pressure sensor and a gas conveying pipeline, wherein the pressurecontainer is used for containing gas and mixed gas and liquid two phases; the atomization nozzle is used for conveying liquid into the pressure container; the pressure sensor is used for monitoring the internal intensity of pressure of the pressure container; the gas conveying pipeline is used for conveying gas to the pressure container and is provided with an air inlet control valve; the pressure sensor and the air inlet control valve implement linkage control. The gas nanobubble generation device also comprises a pipeline with a conveying nozzle, wherein the conveying nozzle consists of oneor a plurality of capillary tubes, or one or a plurality of channels clamped between two boards or among multiple boards; in addition, the size of each capillary tube or channel is smaller than 20 mmon one dimension. The protective gas nanobubble generation device has the advantages of simple structure, convenience in operation and low cost, can adapt to the continuous importing requirements ofprotective gas in large-scale continuous production of fields including chemical engineering, medicine manufacture, food processing industries and the like, and is high in working condition adaptation.