The invention discloses a scrubbing process for raw gas. According to the scrubbing process, crude syngas is washed by a raw gas washing system. The raw gas washing system comprises a scrubbing tower,a circulation system and a venturi scrubber. Crude syngas from a high-temperature high-pressure filter enters the venturi scrubber and is mixed with circulating scrubbing water from the bottom of thescrubbing tower; the formed mixture is fed to the lower part of the scrubbing tower for gas-liquid two-phase separation; an obtained gas phase fully contacts with the circulating scrubbing water andscrubbing tower supplementing water from the bottom of the scrubbing tower sequentially in the process of ascending so as to realize mass transfer and heat transfer, and then the gas phase comes out from the top of the scrubbing tower so as to obtain raw gas which is sent to a conversion unit and a chilled gas compressor; and a liquid phase comes out from the bottom of the scrubbing tower and is pressurized by a circulating water pump, then a part of the liquid phase is sent to the upper part of the scrubbing tower through a circulation pipeline, and another part of the liquid phase enters theventuri scrubber through a circulation pipeline. The process of the invention can comprehensively reduce energy consumption, prolong the service life of a catalyst in the conversion unit and improvethe stability of catalytic reactions.