A camera assembly includes: a hollow lens base, having a first and second accommodation chamber from up to down, an inner diameter of the first accommodation chamber being smaller than that of the second accommodation chamber, the second accommodation chamber being configured to accommodate an image sensor, the top of the first accommodation chamber having an opening; a lens cone, arranged on the lens base and having an extension member at the bottom, an inner diameter of the extension member being greater than an outer diameter of a side wall of the first accommodation chamber; and a driving motor, connected to the lens cone and configured to control the lens cone to move reciprocally in a predetermined direction. During the reciprocal movement, an end surface of the extension member is always located below a top surface of the first accommodation chamber where the opening is provided.