Underground water chlorohydrocarbon pollution remediation system

The utility model provides a groundwater chlorohydrocarbon pollution remediation system. The groundwater chlorohydrocarbon pollution remediation system comprises an aeration system, a chemical injection system, an extraction system and a backflow water replenishing system, the aeration system comprises an aeration pipe group buried in the polluted area and a gas supply device for supplying gas to the aeration pipe group; the chemical injection system comprises a chemical injection pipe group which surrounds the outer side of the aeration pipe group and is embedded in the polluted area, and a chemical supply device for supplying chemical to the chemical injection pipe group; the extraction system comprises an extraction pipe group which surrounds the outer side of the medicine injection pipe group and is buried in the polluted area, a submersible pump which is arranged in the extraction pipe group, and an extraction liquid phase post-treatment device; the backflow water supplementing system comprises a backflo