The invention discloses environment-friendly printing paper. A process for preparing the printing paper comprises the first step of preparing printing composite pulp; the second step of coating the surface of a polyethylene film evenly with the printing composite pulp through a coating roller; after the coating, drying in a drying chamber at 50-60 DEG C, and then performing calendering through a calender; the third step of using the coating roller to evenly coat the bottom surface of the polyethylene film with the printing composite pulp; after the coating, drying in the drying chamber at 50-60 DEG C, and then performing calendering through the calender. Acording to the prepared printing paper, the two sides of the polyethylene film are coated with the printing composite pulp; through thewaterproof performance of the polyethylene film, ink on the two sides of the printing paper can be effectively prevented from permeating or preventing people from seeing ink jet marks on the back, sothat the two sides of the printing paper can be used, and after the ink-jet printing, the two sides do not affect each other, thereby solving the problem that the back of existing paper is easily subjected to permeation or people can see the ink jet marks on the back, and thus the printing paper cannot be used on both sides.