The invention discloses a raw gas processing system. The raw gas processing system comprises a raw gas washing and cooling system and a gas heating and power generating system, wherein the raw gas washing and cooling system is used for washing and cooling high-pressure raw gas exhausted from a gasifier; the gas heating and power generating system comprises a heater and a gas turbo-generator. Washed and cooled high-pressure raw gas is heated by the heater and then input into the gas turbo-generator; the gas turbo-generator is suitable for transforming the input high-pressure raw gas into low-pressure raw gas and converting pressure energy released during transformation of the high-pressure raw gas into electric energy. According to the raw gas processing system, the high-pressure raw gas output by the gasifier is transformed by the gas turbo-generator into low-pressure raw gas capable of being directly used by users and is used for promoting power generation of the gas turbo-generator, so that the pressure energy of the high-pressure raw gas is converted into the electric energy and effectively used, and energy is saved.