Abstract: A multifunctional cover device with a detachable PDA device includes a front cover, a back cover, and at least one rotatable accessory panel connected to the front cover at one side for holding the PDA device and a lighting lamp. The accessory panel is mounted at a concave surface of the front cover when it is folded and at this time, the lamp and the PDA device are aligned with the windows of the front cover. When the accessory board is rotated through 180 degrees from the concave surface of the front cover, it forms an extending front cover panel. According to another structure, the accessory board is slidably mounted in the hollow front cover. Therefore, the user is able to use the PDA device while reading and writing with illumination and sound by playing the PDA device.