The invention discloses a horizontal belt winding assisting device. The horizontal belt winding assisting device structurally comprises a locator, a first side baffle, a belt conveyor, a limiting shaft, a displacement measurer, a supporting plate, a baffle base, limiting baffles, a rotation shaft, a cross rod, a rotation gear, a supporting base block, a distribution box, a motor shell and a secondside baffle. The left side of the front end of the second side baffle is arranged at the rear end of the motor shell, and the rear end of the right side of the second side baffle is welded to the upper end of the supporting base block. The upper end of the cross rod is mechanically connected to the lower end of the baffle base. The two or more limiting baffles are arranged, the lower ends of thelimiting baffles are welded to the upper end of the baffle base, and the limiting baffles and the baffle base are of an integrated structure. The front end and the rear end of the rotation shaft are mechanically connected to the rotation gear. The horizontal belt winding assisting device has the beneficial effects that the displacement measurer is additionally arranged on equipment, during belt winding, the displacement measurer can measure the length of a belt, and when the requirement is met, warning can be conducted, and long-time manual guarding is not needed.