Throat swab with expansion function

The utility model discloses a throat swab with an expansion function, and relates to the technical field of throat sampling. The device comprises a hollow sampling rod with a hollow interior, a rubber ball is fixed at one end of the outer circle face of the hollow sampling rod, a supporting rod extending into the rubber ball is fixed at one end of the hollow sampling rod through a supporting frame, and springs are fixed on the outer circle face of the supporting rod at equal intervals. Rubber plates matched with the inner walls of the rubber balls are fixed to the ends, away from the supporting rods, of the springs. A sampling head sleeve is fixedly arranged on the outer surface of the rubber ball; a sealing cover is fixed at the other end of the hollow sampling rod. When the throat sampling device works, the rubber ball is expanded by virtue of restoring force of the spring, so that the sampling head sleeve on the outer surface of the rubber ball is expanded, the contact area with a throat sampling part is i