The utility model belongs to the technical field of radiation protection, concretely relates to be arranged in high temperature gas cooled to pile air radioactivity graphite dust sample thief. The sampling head is fixed in one -level filter membrane filter chamber front end, one -level filter membrane filter chamber rear end is connected with second grade filter membrane filter chamber, and the junction is provided with one -level sampling filter membrane, second grade filter membrane filter chamber is connected with tertiary filter membrane filter chamber, and the department of connecing is provided with second grade sampling filter membrane, tertiary filter membrane filter chamber is connected with follow -up trachea, and threaded connection department is provided with tertiary samplingfilter membrane, the inside bottom of one -level filter membrane filter chamber, second grade filter membrane filter chamber and tertiary filter membrane filter chamber all is equipped with sampling filter paper, the follow -up trachea of tertiary filter membrane filter chamber is connected with gas flowmeter, flow control valve, is connected with the current stabilizer behind the flow control valve, is connected with the vacuum pump behind the current stabilizer, and the vacuum pump provides the negative pressure in the pipeline through the motor, extracts the export of gaseous passing through gases and discharges. The utility model discloses can effectively sample to the radioactivity graphite dust among the operational environment.