The invention discloses a practical cable device. The practical cable device comprises a reel basal body consisting of a first basal body and a second basal body fixed on the right side of the first basal body; a first sliding groove is formed in the top wall of the right side of the first basal body; a first groove is formed in the left side surface of the second basal body in the first sliding groove, and is in rotary cooperating connection with a first gear; the top of the first gear is in cooperation connection with a first motor; a second sliding groove set in an up-and-down extension mode is formed in the second basal body on the right side of the first groove; a third sliding groove is formed in the right side of the second sliding groove; a first spiral rod set in an up-and-down extension mode is arranged in the third sliding groove; the top of the first spiral rod is in cooperating connection with a second motor; and a channel extending to the left and right sides is formed inthe second basal body below the first groove. The practical cable device is simple in structure and convenient to operate, can realize automatic installation and locking of reels to prevent slippageto improve the mounting stability, and can realize automatic extension of sliding devices to achieve the mounting convenience and speediness to accelerate the replacement speed of the reels.