The invention discloses a book protection device for a library. According to the technical scheme, the book protection device is mainly characterized by comprising a book cabinet and a cabinet door connected to the book cabinet in a slippage manner, the bottom of an opening of the book cabinet is provided with a guide rail allowing the cabinet door to slide thereon, the bottom of the cabinet door is in rotary connection with an idler wheel, and the idler wheel can roll on the guide rail in the length direction of the guide rail; the book cabinet is provided with slippage arms capable of driving the cabinet door to perform reciprocating slippage on the guide rail, one end of each slippage arm is connected with the book cabinet, and the other end of each slippage arm is connected with the cabinet door; each slippage arm comprises a drive motor and a guide barrel which are located at the two ends of the corresponding slippage arm in the length direction, and each guide barrel is internally in slippage connection with a piston rod driven by the corresponding drive motor in the axial direction; and each slippage arm furthermore comprises a driving rotating shaft fixedly connected with the output end of the corresponding drive motor, each drive motor is electrically connected with a start switch capable of starting the corresponding drive motor to drive the corresponding driving rotating shaft to rotate by half a circle, and the start switches are arranged on the book cabinet. By means of the device, protection of books can be improved; and meanwhile, book borrowers can open and close the cabinet door conveniently.