The invention provides a catalyst for selective hydrogenation of C=C double bonds and belongs to the field of fine chemical engineering catalysts and new chemical materials. An electron promoter and Cl<-> are introduced in active components of the catalyst for selective hydrogenation of C=C double bonds, support of the electron promoter and palladium metal is affected through change of the electronic state of the catalyst, side reactions such as a hydrogenation reaction of carbonyl, a hydrogenation reaction or hydrodeoxygenation reaction of carboxyl, a hydrodeoxygenation reaction of hydroxyl linked on benzene rings and a hydrogenation reaction of benzene rings except selective hydrogenation of C=C double bonds in oat alkaloid D are avoided, and the conversion rate and selectivity of selective hydrogenation of C=C double bonds in the oat alkaloid D are improved. Data indicate that the catalyst for selective hydrogenation of C=C double bonds has higher conversion rate and selectivity upto 100%.