The invention discloses a method for preparing nano TiO2*/SiO2*photocatalytic materials, comprising following steps: taking a certain amount of TiO2 to perform 2-5h of calcination at high temperature,then performing aqueous dispersion in de-ionized water according to 0.1-0.2g TiO2/ml to prepare mixed solution, weighting the mixed solution and 30g/L sodium hexametahposphate solution according to aratio by volume of 100-300:1, mixing to obtain solution a; dispersing for 5-15min in the presence of ultrasonic; adjusting pH value to 8-10 at 90 DEG C of water bath to obtain solution b; weighting the solution b and 0.5-0.8mol/L NaSiO3 solution according to a ratio by volume of 8-10:1, keeping the pH value to be constant and reacting for 1-3h, then ageing for 120min at room temperature then centrifuging, adding one time of de-ionized water, centrifuging for 8-15min; then adding 95% ethanol, centrifuging for 8-15min; drying and grinding to obtain the nano TiO2*/SiO2* photocatalystic materials. The method solves the problems that photocatalyst prepared by using the prior preparation method has low dispersivity and low catalyzing and degradation ratio.