The invention relates to a catalyst for preparing 1,3-propanediol by hydrogenolysis of glycerin as well as a preparation method thereof. The catalyst comprises a tungsten oxide-aluminum oxide (WO3-Al2O3) composite carrier and active components which comprise any one selected from ruthenium, rhodium, palladium, iridium and platinum (marked as A) and any one selected from gold, silver, copper, nickel, sodium oxide, lithium oxide, potassium oxide, magnesium oxide, gallium oxide, zinc oxide, iron oxide, molybdenum oxide, lanthanum oxide, zirconium oxide, cobalt oxide, rhenium oxide, tin oxide, and manganese oxide (marked as a component B). The prepared catalyst can be used for generating 1,3-propanediol by hydrogenolysis of glycerin at a certain hydrogen pressure and temperature with high conversion rate and high selectivity.