The invention relates to altering prevention paper and a preparation method thereof, which can be widely applied to altering prevention and anti-counterfeiting of negotiable securities, certificates, bills and secret documents and the like. The altering prevention paper contains altering-prevention agents and/or anti-counterfeiting substances, the using amount of the altering-prevention agents is0.003-0.2 percent according to the total weight of the altering-prevention agents, and the altering-prevention agent is phthalocyanine dye, azoic compound and anthraquinone compound; the altering prevention paper contains 0.03-3g anti-counterfeiting substances in every square meter, the anti-counterfeiting substances are cobalt compound and inducting agents containing manganese ions, the mole ratio of the cobalt compound and inducting agents is 1:1-10:1. The altering prevention paper can be manufactured on a common fourdrinier wire paper machine and a mould paper machine and is compatible with anti-counterfeiting characteristics such as watermark, fine line, special fiber and the like. The altering prevention paper has good inductivity and durability to correction fluid such as organic solvent, acid, alkali, oxidants, reducing agents and erasing fluid, can effectively prevent altering and counterfeiting, and has the characteristics of public identification and being difficult to counterfeit.