The invention provides a coil-paper box, comprising a box body and a box cover, the box body is provided with a roll paper rotating shaft for shelving the roll paper, the lower end of the box body isprovided with a paper outlet. A tearing device is arranged at that paper outlet, the tearing device is a lever mechanism, the lever mechanism includes a support portion, a first arm body, a second armbody and a lever shaft, the first arm body and the second arm body are connected with the supporting part through a lever rotating shaft, and can rotate around the lever shaft as the center, the freeend of the first arm body is parallel to the paper outlet. The support part is fixed at the paper outlet of the paper reel box, and the lever mechanism can prevent the paper reel from rotating aroundthe paper reel rotating shaft when the paper reel is torn, so that the force of stopping the rotation of the paper reel and the force of pulling the free end of the paper reel can break the paper reel of the length, so that one hand can conveniently take the paper reel.