A preservation tube for a sampling swab comprising a tube body, a first cavity for storing a sample releasing agent and a second cavity for placing the sampling swab, wherein the first cavity and the second cavity are provided in the tube body, the first cavity is in communication with the second cavity, and a central axis of the second cavity deviates from a central axis of the tube body, wherein the central axis of the first cavity coincides with the central axis of the tube body, and a side portion of the second cavity is attached to an inner wall of the tube body, and the central axis of the second cavity is parallel to the central axis of the first cavity, wherein the first cavity is a taper hole, the first cavity and the second cavity are partially overlapped to form a first side rib and a second side rib, and a distance between the first side rib and the second side rib is not greater than a smallest diameter of the sampling swab, and wherein a top portion of the first cavity and the second cavity are connected with a second connection portion, the second connection portion being extended between an outer edge of the top portion of the first cavity and the second cavity and the inner wall of the tube body; characterized in that the second cavity is a cylindrical hole, and in that a shape of a projection of the first cavity projected onto a bottom surface of the tube body is a first circle, a shape of a projection of the second cavity projected onto the bottom surface of the tube body is a second circle, the first circle only partially overlaps the second circle, a part of the first circle does not overlap the second circle, the first side rib and the second side rib are formed at positions where an edge of the first circle and an edge of the second circle overlap. a tube body, a first cavity for storing a sample releasing agent and a second cavity for placing the sampling swab, wherein the first cavity and the second cavity are provided in the tube body, the first cavity is in communication with the second cavity, and a central axis of the second cavity deviates from a central axis of the tube body, wherein the central axis of the first cavity coincides with the central axis of the tube body, and a side portion of the second cavity is attached to an inner wall of the tube body, and the central axis of the second cavity is parallel to the central axis of the first cavity, wherein the first cavity is a taper hole, the first cavity and the second cavity are partially overlapped to form a first side rib and a second side rib, and a distance between the first side rib and the second side rib is not greater than a smallest diameter of the sampling swab, and wherein a top portion of the first cavity and the second cavity are connected with a second connection portion, the second connection portion being extended between an outer edge of the top portion of the first cavity and the second cavity and the inner wall of the tube body; characterized in that the second cavity is a cylindrical hole, and in that a shape of a projection of the first cavity projected onto a bottom surface of the tube body is a first circle, a shape of a projection of the second cavity projected onto the bottom surface of the tube body is a second circle, the first circle only partially overlaps the second circle, a part of the first circle does not overlap the second circle, the first side rib and the second side rib are formed at positions where an edge of the first circle and an edge of the second circle overlap.