The invention relates to an acetylene removal method in a front-end depropanization front-end hydrogenation process. The acetylene removal method is characterized in that a small quantity of alkynes and diolefins in a tower top effluent of a depropanization tower in a front-end depropanization process are subjected to selective hydrogenation; a raw material comprises the following components in volume ratio: 30-40 percent of methane, 15-25 percent of hydrogen, 8-15 percent of ethane, 30-45 percent of ethylene, 5-10 percent of propane, 5-10 percent of propylene, 0.1-0.5 percent of propadiene, 0.5-1.0 percent of acetylene and 0.1-0.5 percent of propyne. The first-section reaction temperature is 50-100 DEG C, the second-section reaction temperature is 50-100 DEG C, the third-section reaction temperature is 50-100 DEG C, the pressure is 1.5-4.0 MPa, and the airspeed is 10000-2000 h<-1>. A catalyst carrier is high-temperature resistant inorganic oxide, and an active component at least contains Fe and Cu; calculated by 100 percent by weight of catalyst, the catalyst contains 5-15 percent of Fe and 0.1-0.5 percent of Cu; the specific surface is 10-300 m<2>/g; the pore volume is 0.2-0.65 ml/g. With the adoption of the acetylene removal method provided by the invention, the catalyst is moderate in reaction activity, good in operational flexibility, good in ethylene selectivity and much lower than a noble metal catalyst in production amount of green oil.