The invention discloses a high-voltage transmission line cross and span pay-off construction anti-wear device. The device comprises an upper half pipe and a lower half pipe, the upper half pipe and the lower half pipe are in butt joint to form a hollow circular pipe, and the inner diameter of the circular pipe is equivalent to the outer diameter of a high-voltage transmission line. Anti-off structures are symmetrically arranged at the ends of the upper half pipe, first fixing devices are symmetrically arranged at the section of the upper half pipe outside of the anti-off structures, and each first fixing device is provided with a circular hole in the middle. The lower half pipe is provided with a center-of-gravity balance structure, second fixing devices are symmetrically arranged in positions, corresponding to the first fixing devices, of the section of the lower half pipe, and each second fixing device is provided with a bolt in the middle. The outer diameter of the bolts is equivalent to the diameter of the circular holes. The bolts are each equipped with a matching nut. The safety factor of pay-off construction is improved effectively. The device can be reused, and needs no human care after installation. The construction cost is greatly reduced.