The utility model relates to a large-span telescopic general tower head clamp which comprises an intermediate beam, two sleeve beams symmetrically and movably connected to the two sides of the intermediate beam, a hook-end bolt and a pulley wire hanging rod, wherein a U-shaped connector provided with a horizontal threaded hole and a vertical threaded hole is connected to the tail end of each sleeve beam, the hook-end bolt is connected with the U-shaped connectors through vertical threaded holes, and the pulley wire hanging rod is connected with the U-shaped connectors through horizontal threaded holes. The large-span telescopic general tower head clamp comprises an intermediate beam and two sleeve beams symmetrically sleeved on the intermediate beam, and the intermediate beam and two sleeve beams are connected through locking bolts. The sleeve length of the intermediate beam and two sleeve beams is adjustable and bearing forces at two sides are mutually constrained. Since the length is adjustable, the large-span telescopic general tower head clamp is suitable for cross arm heads of all widths. The sleeve beams are connected with U-shaped connectors, which increases pressure and makes the force born by force bearing points of main part of a cross arm uniform to prevent deformation due to super high bearing force.