Natural gas purification system and method

The invention relates to the technical field of natural gas, particularly to a natural gas purification system and method. Natural gas enters a gas-liquid separator through a gas inlet pipeline to besubjected to gas-liquid separation, then, the separated gas phase enters an absorption tower to remove H2S and CO2, a gas phase from which H2S and CO2 are removed is communicated with a downstream pipeline through a pipeline, a liquid phase in the absorption tower enters a regeneration unit for treatment through a pipeline, the treated liquid phase enters a mixer to be mixed with water in a waterinlet pipeline, the mixed liquid phase is cooled through a cooler and then enters an absorption tower through a solution pump to be reused for absorption of H2S and CO2. The natural gas purification system and method provided by the invention can be widely applied to recovery and utilization of domestic remote well site gas, vent gas and site associated gas, have certain economic benefits, can reduce H2S and CO2 emission,