The invention belongs to the field of smart home furnishing, and in particular relates to a paper reel which automatically prompts and warns of the volume of paper rolls. The plates are fixedly connected, a rotating shaft is connected between the two fixed plates, the lower end of the rotating shaft is fixedly connected with a dustproof plate, and a control box is fixedly connected to the side wall of one of the fixed plates, and one end of the rotating shaft rotates through the fixed plate and is rotatably connected to the control box On the inner wall, the control box is equipped with a power supply, the positive output end of the power supply is fixedly connected to the output ring, both ends of the output ring are fixedly connected to the output column, the negative input end of the power supply is fixedly connected to the outer ring rail, and the other end of the outer ring rail is fixedly connected to a The outer contact column is connected with a warning light in series on the outer ring rail, and an inner ring rail is arranged on the inner side of the outer ring rail. The present invention can automatically detect the remaining volume of roll paper in the paper reel in real time by setting a warning light and a safety light, and give a warning prompt when it is insufficient.