A gripper, comprising: a lead screw comprising a spiral portion and a driving portion, the spiral portion being provided with at least one first spiral track and at least one second spiral track with opposite helical directions, wherein a first end of the first spiral track corresponds to a first end of the spiral portion, and a second end of the first spiral track extends toward a second end of the spiral portion, wherein a second end of the second spiral track corresponds to the second end of the spiral portion, and a first end of the second spiral track extends toward the first end of the spiral portion, characterized in that: a portion of a coverage of the first spiral track overlaps a portion of a coverage of the second spiral track along a length of the spiral portion; and the gripper comprises a first gripping jaw and a second gripping jaw, the first gripping jaw having at least one first pin extending into the first spiral track, and the second gripping jaw having at least one second pin extending into the second spiral track, wherein the first gripping jaw and the second gripping jaw are configured in such a way that when the driving portion drives the spiral portion to rotate, the first spiral track is configured to drive the first pin to allow the first gripping jaw to perform a first linear movement in a direction parallel to the lead screw, and the second spiral track is configured to drive the second pin to allow the second gripping jaw to perform a second linear movement opposite to the first linear movement of the first gripping jaw. a lead screw comprising a spiral portion and a driving portion, the spiral portion being provided with at least one first spiral track and at least one second spiral track with opposite helical directions, wherein a first end of the first spiral track corresponds to a first end of the spiral portion, and a second end of the first spiral track extends toward a second end of the spiral portion, wherein a second end of the second spiral track corresponds to the second end of the spiral portion, and a first end of the second spiral track extends toward the first end of the spiral portion, characterized in that: a portion of a coverage of the first spiral track overlaps a portion of a coverage of the second spiral track along a length of the spiral portion; and the gripper comprises a first gripping jaw and a second gripping jaw, the first gripping jaw having at least one first pin extending into the first spiral track, and the second gripping jaw having at least one second pin extending into the second spiral track, wherein the first gripping jaw and the second gripping jaw are configured in such a way that when the driving portion drives the spiral portion to rotate, the first spiral track is configured to drive the first pin to allow the first gripping jaw to perform a first linear movement in a direction parallel to the lead screw, and the second spiral track is configured to drive the second pin to allow the second gripping jaw to perform a second linear movement opposite to the first linear movement of the first gripping jaw. a portion of a coverage of the first spiral track overlaps a portion of a coverage of the second spiral track along a length of the spiral portion; and the gripper comprises a first gripping jaw and a second gripping jaw, the first gripping jaw having at least one first pin extending into the first spiral track, and the second gripping jaw having at least one second pin extending into the second spiral track, wherein the first gripping jaw and the second gripping jaw are configured in such a way that when the driving portion drives the spiral portion to rotate, the first spiral track is configured to drive the first pin to allow the first gripping jaw to perform a first linear movement in a direction parallel to the lead screw, and the second spiral track is configured to drive the second pin to allow the second gripping jaw to perform a second linear movement opposite to the first linear movement of the first gripping jaw.