The invention discloses a clamping and conveying device, which belongs to the technical field of transmission line equipment. The device comprises a magnifying mechanism, sliders, a spring, grippers and pin shafts, wherein the magnifying mechanism is composed of a plurality of magnifying units which are connected in series, and each magnifying unit is composed of connecting rods intersecting with each other, a rotating shaft and a nut. The spring is connected with the two sliders. When the sliders are pressed by a hand, the spring is compressed, the magnifying mechanism moves telescopically, and the grippers are driven to move to make the displacement of the mechanism amplify and the grippers clamp. The clamping and conveying device disclosed by the invention can be retracted freely, is small in size, occupies less space, is easy to replace, and can be widely used for clamping cables or high voltage switches and maintaining overhead cables. The clamping and conveying device can be live operated, and no electric shock accident occurs, thus realizing high safety.