The invention discloses a preparation method of odor-free correction liquid and belongs to the technical field of preparation of correction liquids. The method includes the steps of: performing microwave treatment to potato starch and deionized water and adding ammonium persulfate, heating the mixture liquid and regulating the pH of the mixture liquid, and adding dicyandiamide to regulate the pH again to prepare a crosslinked modified oxidized starch adhesive; and then stirring and ball-milling zinc powder in deionized water with sodium dodecyl benzene sulfonate and titanium dioxide to obtain white slurry, and uniformly stirring and mixing the white slurry, polyacrylate emulsion and the adhesion and ball-milling the mixture to prepare the odor-free correction liquid. The preparation method is simple and is prepared from toxic-free materials. Water serves as a main solvent so that the correction liquid is good in covering property and is odor-free. The correction liquid has no toxic and side effects on human body after long-time use, and has a wide market prospect.