On-site material evidence collection device and viscous collection cotton swab

The utility model discloses an on-site material evidence collection device and a viscous collection cotton swab. The device comprises a pipe body and a plug body matched with an opening in one end ofthe pipe body, a cotton swab is connected to one end, positioned in the tube body, of the plug body; the cotton swab comprises a cotton swab rod and a cotton head wrapping one end of the cotton swab rod. The cotton swab is characterized in that a shear mark is arranged at the position, close to the cotton head, of the cotton swab rod, a sleeve is arranged, the cotton swab rod is sleeved with the sleeve, the sleeve is provided with a first position and a second position which are formed by sliding relative to the cotton swab rod, and at the first position, the shear mark is located in the sleeve, and at the second position, the shear mark is exposed out of the end of the sleeve; and the periphery of the cotton head is coated with an adhesive layer. The cotton swab cannot fall off in the transportation process, mean