Nucleic acid extraction instrument convenient for sample loading

The nucleic acid extraction instrument comprises a base, a bearing assembly, a magnetic rod assembly, a magnetic sleeve assembly, a sliding assembly and a moving assembly, the magnetic rod assembly and the magnetic sleeve assembly are both arranged on the moving assembly, the moving assembly is arranged on the base, the bearing assembly is connected to the base in a sliding mode through the sliding assembly, and the bearing assembly is connected to the base through the sliding assembly. The sliding assembly comprises a sliding rail, a sliding block, a speed reducing mechanism, a cross beam, a limiting strip, a limiting block and an elastic piece, the sliding assembly is additionally arranged between the base and the bearing assembly, the speed reducing mechanism makes contact with the limiting strip through the speed reducing effect of the speed reducing mechanism, the speed reducing mechanism decelerates the bearing assembly at the moment, and therefore slow speed reduction of the bearing assembly is achieve