The present invention relates to a nickel-based catalyst. The catalyst is prepared by loading metallic nickel active components on a composite carrier which consists of an aluminum oxide-titanium oxide complex and ZSM-5, wherein in the catalyst, a weight ratio of aluminum oxide and titanium oxide is 4:1; a content of nickel oxide is 12%-20% by weight; the aluminum oxide-titanium oxide takes 30%-70% of the entire composite carrier by weight, the ZSM-5 takes 30%-70% of the entire composite carrier by weight; the surface area of the catalyst is 90-260 m 2/g; and the pore volume is 0.5-1.5 ml/g. The catalyst has characteristics of good low-temperature hydrogenation activity, strong anti-impurity ability and sol ability, a long regeneration cycle, and good stability. Applying the catalyst to a process in which diene is converted to monoolefins through selective hydrogenation can maintain a good hydrogenation effect.