Abstract: An automated nucleic acid extraction device includes a base body, a cassette, a driving unit, a moving frame and a syringe. The base body includes a sample accommodating area, a column accommodating area, a cassette accommodating area and a collection tube being arranged in a linear direction. The cassette is arranged in the cassette accommodating area and includes two parallel walls and at least four vertical walls. The parallel walls and the vertical walls jointly form a lysis buffer well, at least one wash buffer well and an elution buffer well. Each vertical wall includes a load-bearing abutment. The driving unit and the moving frame are arranged on the base body. The syringe is arranged on the moving frame and is driven by the driving unit to reciprocate along with the moving frame in the linear direction.

Abstract: A fixed tube of a nucleic acid extraction component and a nucleic acid extraction component. The nucleic acid extraction component includes a membrane column, which is fitted over the fixed tube. The fixed tube has a tube body, a tube opening, and a bottom. The tube body extends along a first direction. The end of the tube opening distal from the tube body has a protrusion which protrudes along a second direction, the first direction being vertical to the second direction. The bottom and the tube opening are respectively connected to two opposite sides of the tube body. The bottom has a shoulder and the shoulder of the bottom is connected to the membrane column.