The invention discloses a method for synthesizing 2-cyclopropyl-8-methylquinazoline. The method comprises: orderly adding (2-amino-3-methylphenyl)methanol, cyclopropyl formonitrile, a catalyst, a baseand a solvent into a reactor and carrying out magnetic stirring in air for a full reaction in an oil bath pot. The method utilizes alcohol as a starting material for the formation of C-N bonds and the alcohol is cheap, easy to treat and environmentally friendly. The method solves the problem that the conventional method utilizes various oxidizing agents to produce a large amount of by-products. The method utilizes an NNN type pincerlike metal ruthenium (II) compound as a catalyst for the catalytic reaction so that the reaction is finished in one step, the reaction time is greatly shortened, operation is simple and the reaction efficiency is high. The method satisfies the green chemistry sustainable development requirements.