The invention discloses a clamping device which is used for clamping, fixing and dragging a clamped object. The clamping device comprises a first operating hook and a second operating hook, wherein the first operating hook and the second operating hook are hinged to each other. The first operating hook comprises a first hook body arranged at the front end and a first driving rod arranged at the rear end. The second operating hook comprises a second hook body arranged at the front end and a second driving rod arranged at the rear end. The first driving rod is hinged to a first connecting rod, the second driving rod is hinged to a second connecting rod, and the first connecting and the second connecting rod are hinged to each other to enable the first driving rod, the second driving rod, the first connecting rod and the second connecting rod to form a quadrangle. The clamping device has the advantages of reducing security risks caused by felling and clip of critical trees, ensuring safety of workers, being capable of ensuring safe and stable operation of lines, and preventing severe accidents such as line tripping from happening.