DNA concentration device for forensic science

The utility model provides a DNA (deoxyribonucleic acid) concentration device for forensic science. The concentration device comprises a concentration pipe, a vacuum pipe, a nano-filtration membrane, a mounting unit and a sealing connection unit, a detachable nano-filtration membrane is arranged at the lower end of the concentration pipe through a mounting unit, and the mounting unit is connected with the vacuum pipe through a sealing connection unit; the installation unit comprises a locking structure, a first sealing ring, an installation cylinder, clamping blocks and an installation boss, the upper end of the installation cylinder is slidably sleeved with the lower end of the concentration pipe, the multiple clamping blocks are fixed to the inner wall of the upper end of the installation cylinder, the installation boss is fixed to the inner wall of the lower end of the installation cylinder in a sealed mode, and the nanofiltration membrane is detachably arranged on the upper end face of the installation bo