The invention discloses a removing device for siloxanes in biomass gas. The removing device comprises a refrigeration circulating unit, a refrigerating medium circulating unit and a biomass gas siloxane removing unit. A cold storage tank is arranged and used for cold storage of a refrigerating medium. Two heat exchangers used for removing the siloxanes work alternately. Incoming biomass gas is precooled through the refrigerating medium subjected to heat exchange with the biomass gas and the biomass gas with the siloxanes removed. The removing device can adapt to different working conditions, and is suitable for removing siloxane gas in the biomass gas in actual operation so as to ensure efficient application of the biomass gas.