The present invention discloses a cable distribution device for an optical network, including a tray and a cable distribution structure for an intelligent optical network, where the tray is provided with multiple first interfaces, the cable distribution structure for an intelligent optical network includes multiple attachment plates, an upper cover, a circuit board, and a bottom cover, the circuit board is installed on the upper cover, the upper cover is installed on the bottom cover, one end of each attachment plate is installed on the bottom cover, and the other end of each attachment plate is inserted into the first interface of the tray, so that the cable distribution structure for an intelligent optical network is installed on the tray. According to the cable distribution device for an optical network provided in the present invention, a cable distribution structure for an intelligent optical network may be installed on a tray by using attachment plates, so that an existing ODN can be transformed into an IODN without transforming a structure of the tray and interrupting an optical fiber transmission service, thereby solving problems in the prior art of high costs and inconvenience to a user that are caused by transformation of the tray.