The utility model discloses a cable core wire end identification instrument which belongs to the technical field of cables. The cable core wire end identification instrument is composed of a master and a slave, wherein the master and the slave are respectively arranged on both ends of a cable. A battery, a switch, an indication lamp, a buzzer, a collinear clip and a select switch are arranged in the master, wherein the indication lamp and the buzzer are connected in parallel. The slave is not provided with a battery and a switch. The slave is provided with an indication lamp, a buzzer, a collinear clip and a select switch. The collinear clips clip a cable shielding layer to form a common wire. A common wire is prepared for the cable without shielding layer. The master and the slave are connected through a wire which is the shielding layer or the common wire. A cable core wire which is connected between the select switches in the master and the slave is used as the other wire. Knobs of the select switches are turned. If the two select switches are connected with both ends of the same core wire, a circuit between the master and the slave is switched on. The indication lamps light up and the buzzers sound, which shows that both ends belong to the same core wire. Acousto-optic double insurance showing is reliable. The efficiency is high. The cable core wire end identification instrument is used for cable core wire end identification.