The invention discloses a method for catalyzing propene epoxidation by taking Titanium Silicalite-1(TS-1) as a catalyst, wherein hydrogen peroxide is taken as an oxidant, and Titanium Silicalite-1(TS-1) is taken as the catalyst. A ring-opening reaction of epoxypropare and a solvent can be inhibited effectively by adding a small amount of inorganic alkali buffer solution in a liquid reactant; a buffer agent can be ammonium salt, borate, phosphate or other alkali buffer solvents; and an inorganic salt alkali buffer solution is a mixed solution composed of a weak-base salt and conjugate acid thereof and can be taken from weak base of ammonium salt, borate, phosphate or carbonate, and the corresponding negative ion is Cl<->, Br<->, NO<3-> or SO4<2->, and the positive ion is Li<+>, Na<+> or K<+>. The selectivity of epoxypropare can reach 97.49%, the yield of the epoxypropare can reach 96.56%, and the conversion rate of hydrogen peroxide can reach 99.12%.