Cotton swab for evidence collection through dry-wet two-step method

The utility model belongs to the technical field of biological evidence obtaining equipment, and particularly relates to a cotton swab for evidence obtaining through a dry-wet two-step method. The handheld handle seat and the extrusion handle seat are connected together, connecting threaded openings are formed in the outer sides of the handheld handle seat and the extrusion handle seat, and a pair of plastic connecting rods are connected to the middles of the connecting threaded openings; the top end of the upper plastic connecting rod is connected with a dry cotton swab head, and the top end of the lower plastic connecting rod is connected with a wet cotton swab head; a liquid storage bag is embedded in the extrusion handle seat, and the liquid storage bag is matched with an extrusion groove in the surface of the extrusion handle seat to achieve manual pressing; the liquid storage bag is connected with the wet-type cotton swab head through a conveying thin tube which is inserted into the plastic connecting r