The invention provides a catalyst for olefin metathesis, a preparation method thereof and a method for an olefin metathesis reaction by applying the catalyst. The catalyst comprises a carrier and an active component, wherein the carrier is a mesoporous titanium silicate molecular sieve, and the active component is a tungsten oxide. In the method for an olefin metathesis reaction by utilizing the catalyst, the reaction temperature is 100-450 DEG C, and the weight hourly space velocity is 1.6-8h<-1>. Compared with the conventional WO3/SiO2 catalyst, the activity of the catalyst is higher.