The invention relates to an additional device for a warp-feeding roller used for removing static electricity which is under the warp-feeding roller. The additional device comprises an additional roller and a water trough. The water trough is fixedly mounted onto supports. The additional roller is located above the water trough and mounted to the supports by means of a bearing. The outer surface of the additional roller is wrapped by a sponge layer. A part of the outer surface of the additional roller is located into a trough cavity of the water trough. The additional roller is tangent to the warp-feeding roller.The additional device for the warp-feeding roller used for removing static electricity has following beneficial effects: by filling water into the trough cavity of the water trough, the sponge layer of the additional roller becomes moistening and is then in contact with the warp-feeding roller tangent to the additional roller so that the surface of the warp-feeding roller becomes moistening; during warp delivery, warps do not deviate from an original delivery path due to an electrostatic effect, thereby avoiding mixing, knotting, warp breakage and other phenomena; outage rate caused by the above phenomena is decreased and production efficiency is increased; and quality of cylindrical weaved cloth is improved.