Refining method of raw material gas containing ethene in process of preparing ethylbenzene from ethene

The invention discloses a refining method of raw material gas containing ethene in the process of preparing ethylbenzene from ethene, comprising the steps: raw material gas containing ethene and dilute ethene gas returned by a catalytic cracking or splitting device are mixed or respectively enter from the lower part of an absorbing device, are contacted with an absorbent entering from the upper part of the absorbing device for refining, the refined raw material gas enters a reaction part of an ethylbenzene device to react with benzene to prepare the ethylbenzene, the saturated absorbent is desorbed and then recycled, and desorbed gas enters a catalytic cracking or catalytic splitting device. The method has simple flow, low investment and favorable refining effect, and ensures that the unreacted rate of propylene is as high as 98.1-99.9 percent.