The application relates to the technical field of
straight tube cameras, and discloses a
straight tube camera which comprises a back cover, the surface of the back cover is threadedly connected with a tube body, the end, away from the back cover, of the tube body is threadedly connected with a
front cover, the inside of the
front cover is provided with lens one and lens two, the inside of the back cover is provided with a camera main body, the inside of the
front cover is provided with a lens mounting component, and the back cover, the tube body and the front cover are all made of
radiation-resistant materials; the lens mounting component comprises a
retainer, the end of the
retainer is in contact with the end of the back cover, and the end of the
retainer and the end of the back cover are threadedly connected through a screw rod one. When the triangular block moves, the inclined surface pushes the inclined surface
extrusion ring to move, the inclined surface
extrusion ring pushes the
rubber ring to extrude the inner wall of the sealing groove when moving, so that the sealing effect of the tube body and the front cover is improved, the inclined surface
extrusion ring extrudes the
rubber ring to expand when moving, the
rubber ring extrudes the inner wall of the front cover and the tube body when expanding, so that the sealing performance after the tube body and the front cover are installed is improved, and the sealing effect after the camera is installed is improved.