A novel ethylene generator is disclosed. The ethylene generator includes a material feeding pipe and ethanol. The ethanol is in the material feeding pipe. One end of the material feeding pipe is disposed in a curved reaction tube, and the other end of the curved reaction tube is connected to a plastic hose. The middle of the plastic hose is provided with a roller clamp. The curved reaction tube isV-shaped. One side, which is connected to the material feeding pipe, of the curved reaction tube is provided with an aluminum sheet sleeve outside, and contains fine iron scraps, and the other side of the curved reaction tube is disposed on an aluminum sheet tank and contains Al2O3 and a coarse iron scrap carrier. Fine steel wire balls are disposed in two ends of the curved reaction tube. A big-flame alcohol burner is below the aluminum sheet tank. The ethylene generator has advantages of a simple structure, convenient mounting, no need of reaction tube changing and washing, and easy additionof the ethanol in the reaction tube. The ethylene generator facilitates experiment repeatability and continuity.