The invention discloses a method for preparing an ETS-10 titanium-silicon molecular sieve. The method comprises the steps of: firstly, adding a titanium source into water, then adding an acid source into the mixture, stirring the mixed solution at room temperature to perform hydrolysis, standing the solution and separating an organic layer to obtain an acid titanium precursor; secondly, dissolving a sodium source and a potassium source in the water, adding a silicon source into the mixture and stirring the mixed solution uniformly to obtain an alkali silicon precursor; thirdly, adding solution of the acid titanium precursor into solution of the alkali silicon precursor dropwise, stirring the mixed solution to form uniform sol, adding seed crystals in an amount which is 1 to 5 percent based on the weight of SiO2 in the silicon source into the system and continuously stirring the obtained product to form uniform sol, wherein the pH value of the system is between 13 and 14; fourthly, filling the prepared sol into a high-pressure kettle to perform static crystallization for 3.5 to 24 hours at the temperature of between 180 and 200 DEG C; and finally, filtering, washing, drying and roasting the crystals to obtain the ETS-10 titanium-silicon molecular sieve. The method for preparing the ETS-10titanium-silicon molecular sieve has the advantages that: the crystallization time is short; the crystallization degree of the synthesized ETS-10titanium-silicon molecular sieve is high; the titanium source is liquid, so the dissolving time is short; the operation is simple and convenient; and the synthesis efficiency is high.