The 3D printing test line for lithium metal all solid state batteries is mainly used to achieve integrated production and manufacturing of lithium negative electrode all solid state batteries in glove boxes. Through raw material baking, weighing, vacuum stirring, electrode sheet composite electrolyte 3D printing, rolling, lithium metal cutting, lithium metal negative electrode sheet making, press fit electrode ears, electrode sheet cutting and forming, electrode sheet stacking, bare cell hot pressing testing, ultrasonic welding, aluminum-plastic film top side sealing, vacuum packaging, single cell assembly is achieved.