Integral automatic synchronous pre-tightening device for steel strand group anchor inhaul cables

The invention discloses an integral automatic synchronous pre-tightening device for steel strand group anchor inhaul cables. An integral multi-cylinder single pre-tightening jack is fixed to the left end of a top plate and comprises an oil cylinder and pistons. Multiple piston holes are formed in the oil cylinder. The pistons are arranged in the piston holes to form an integral multi-piston structure. The pistons are provided with through holes, hollow wraps are connected into the through holes of the pistons in a sleeved manner, and the hollow wraps are fixed to the oil cylinder to form a structure that the pistons move relative to the oil cylinder and the hollow wraps. The left end of the integral multi-cylinder single pre-tightening jack is connected with a single-hole tool anchor plate, the left end of a tensioning pedestal is connected with an anchor gear, the anchor gear is provided with holes allowing steel strands to pass, and it is guaranteed that the steel strands pass the holes. The integral automa