A zoom structure includes a light source, a first sleeve, a second sleeve, a lens fixedly connected with the first sleeve and a limitation element. The second sleeve and the first sleeve are coaxially arranged, the second sleeve is rotationally connected with the limitation element in a circumferential direction. The second sleeve is provided with a plurality of spiral sliding grooves. The first sleeve is provided with a plurality of sliding structures connected with the spiral sliding grooves. A position of the light source module is fixed. The lens is opposite to the light source module in the axial direction. The second sleeve is rotatable relative to the limitation element in the circumferential direction. The spiral sliding grooves push the sliding structures to move on the limitation element in the axial direction, the sliding structures then drive the first sleeve and the lens to move in the axial direction.