PLA coated paper is a kind of composite material that uses PLA raw material particles to be coated on the surface of paper by tape casting machine. The main feature of this composite material is oil-proof, water-proof and heat sealing. Different uses take their different characteristics: when it is used to pack hamburgers, take their oil proof characteristics. When it is used for copper plate paper packaging, its water-proof property is taken. When it is used in automatic packaging machine, its heat sealing property is taken.