The invention relates to the technical field of oil field oil production engineering and provides to a cable pre-arrangement device used for a horizontal well. The cable pre-arrangement device used for the horizontal well provided by the invention is designed for solving problems of rolling compaction, intertwining and breakage during a horizontal well cable arrangement process. The cable pre-arrangement device used for the horizontal well is composed of an upper joint (1), a bailer head (2), a seal ring (3), a bailer headstock (4), a shear pin (5), a copper ring (6), a shear pin block (7), a bearing fastening ring (8), a bearing (9), a barrier plate (10), a central pipe (11), a cable leading-out device (12), a fastening pin (13), a sleeve (14), an anti-rotation base (15), an anti-rotation pin (16), a connection sleeve (17), a seal ring (18), a fastening nut (19), a lower joint (20) and a cable (21). The device provided by the invention is mainly applied to a horizontal well cable arrangement process and has advantages of simple structure, high release success rate, high space utilization rate and the like.