The invention provides an automatic code tagging machine for sheet materials. The automatic code tagging machine comprises a pedestal, wherein one side of the pedestal is provided with a control electrical cabinet, and two sides of the pedestal are respectively provided with a feeding machine and a material coiling machine; a driving roller support rack, a driven roller support rack, a vacuum sucking plate support rack and a jet printing support rack are arranged on the pedestal; a driving roller is arranged on the driving roller support rack and is connected to a driving roller servo motor through a shaft coupling device, a roller balancing device is arranged on the driving roller, the driven roller support rack is provided with a driven roller, and the vacuum suction plate support rack is provided with a vacuum suction plate on which a spacer pin is arranged; a leading screw, guide rails, an origin switch, a spraying nozzle support rack and a code spraying servo motor are mounted on the jet printing support rack; a sheet material sensor, a spraying nozzle and a curing lamp are disposed on the spraying head support rack. The automatic code tagging machine for sheet materials is characterized by simple manufacture technology and structure and high equipment automation degree. Code tagging is directly performed on PE sheet materials which are then made into two dimension code pads through overlay film stamping operation, and therefore production cost is greatly saved.