The invention discloses a preparation method for wallpaper for a children room. The preparation method comprises the following steps: smashing, mixing and cooking wood dust, bamboo leaf, peach tree bark, cypress bark, hemp, straws, wheat straws, dandelions, mint, chloris virgata, a reinforcing filler and lime water to prepare slurry; performing washing, bleaching, knocking, paper fishing, drying and paper baking on the slurry to prepare an anti-wallpaper base layer material; (2) conveying the wallpaper base layer material into a first coating machine, coating the surface of the wallpaper baselayer material with a carbon fiber material through an adhesive, drying the surface with hot air, and cooling the material to obtain a wallpaper semifinished product; and (3) performing pattern printing, hot air drying, waterproof layer printing and hot air drying on the wallpaper semifinished product in sequence to prepare the wallpaper for the children room. The wallpaper for the children room can greatly improve the electromagnetic shielding performance of the wall body of the children room; and furthermore, the preparation raw materials of the wall paper are healthy and environmentally friendly, so that a healthier and safer growing environment can be better provided for newborns.