The invention relates to a catalyst for liquid-phase hydrogenation olefin removal of attapulgite-based reformate, and an application of the catalyst. According to the catalyst, modified attapulgite acidized by inorganic acid is used as a carrier, and the catalyst contains 0.1-3.0wt% of active components and 0.05-2.0wt% of an addition agent. The catalyst prepared by a preparation method disclosed by the invention is used for liquid-phase continuous hydrogenation olefin removal of the reformate, under the condition that the reaction temperature is 120-180 DEG C, the reaction pressure is 1.0-2.0MPa, the air speed is 1-12h<-1> and the hydrogen-oil ratio is (6 to 1) to (16 to 1), trace olefin in the reformate can be effectively removed, the bromine index of products is smaller than 100mg Br/100g oil, and the loss of arene is less than 0.5wt%. The catalyst disclosed by the invention has the following advantages that the catalyst is environmental-friendly and does not have a pollution problem existing in a conventional carclazyte technology, the attapulgite is low in price, compared with the cost of other catalysts, the cost of the catalyst disclosed by the invention is greatly reduced, and besides, the catalyst is good in catalysis activity and long in service life.