The utility model discloses a fast guide device for secondary cable laying in a cable channel, which is characterized by consisting of a cable fixing rod (1), a telescopic rod (6) and a locking screw (7), wherein a guide head (2) is fixed at the front end of the cable fixing rod (1), the front end of the guide head (2) is provided with an illumination lamp head (3), a battery is arranged in a cavity of the guide head (2), a switch (4) is arranged on the side wall of the guide head (2), the battery is connected with the switch (4) and the illumination lamp head (3) through conducting wires, the back end of the cable fixing rod (1) is sheathed with the telescopic rod (6), the front end of the telescopic rod (6) is provided with the locking screw (7), and the front end of the telescopic rod (6) and the back end of the cable fixing rod (1) are fixed into a whole by the locking screw (7). The fast guide device for the secondary cable laying in the cable channel has the advantages that the structure is simple, the use is convenient, the time and the labor are saved, and the work efficiency is improved.