The utility model discloses a gas-solid two-phase flow sampling device. The gas-solid two-phase flow sampling device comprises a sampling pipeline provided with a smoke sampling tube (15), a cyclone separator (3) and an air pump (9), wherein the gas-solid two-phase flow sampling device also comprises a circulating soot blowing pipeline provided with a smoke circulating pump (6); one end of the circulating soot blowing pipeline is connected with an exhaust port of the cyclone separator (3), and the other end of the circulating soot blowing pipeline is connected onto the smoke sampling tube (15) and is communicated with the smoke sampling tube (15). The gas-solid two-phase flow sampling device disclosed by the utility model can be used for soot blowing under the condition that the sampling process is not interrupted, so that the smoke sampling tube is prevented from being blocked by particles; the gas-solid two-phase flow sampling device has the advantages of high sampling efficiency, good adaptability, high reliability and the like.