Magnetic bar sleeve and novel nucleic acid extraction machine

The utility model discloses a magnetic bar sleeve which comprises a nucleic acid extraction instrument main body and a plurality of magnetic bar sleeves arranged on the nucleic acid extraction instrument main body, the nucleic acid extraction instrument main body is provided with a mounting mechanism for mounting the plurality of magnetic bar sleeves, and the mounting mechanism comprises a mounting plate arranged on the nucleic acid extraction instrument main body; the mounting plate is provided with a clamping groove and a plurality of through holes which are communicated with the clamping groove and are in matched insertion connection with the plurality of magnetic bar sleeves, the magnetic bar sleeves are provided with magnetic bar sleeve connecting plates which are in matched clamping connection with the clamping groove, the mounting plate is provided with a pressing mechanism for pressing the magnetic bar sleeve connecting plates, and the pressing mechanism comprises a first L-shaped block and a second L