The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a catalyst for preparing an HZSM-5 molecular sieve of propylene by using methanol/ dimethyl ether, a preparation method and application. The catalyst adopts an impregnation method, the HZSM-5 catalyst is modified by a tungsten element, and weight percentage of W is 0.005 to 10 percent. The reaction temperature is controlled at between 300 and 600 DEG C, the pressure is 0 to 1.0MPa, the liquid hourly space velocity is 0.1 to 10 h<-1>, the methanol or the dimethyl ether is used as raw material gas, water vapor or nitrogen gas is used as diluent gas, and the gases are subjected to methanol-alkene reaction. The catalyst has the advantages that high propylene and ethylene ratio can be obtained when the catalyst keeps high activity.