The utility model relates to an electric current kills nemic device of tobacco root knot, including generator, rectifier, impulse generator, a plurality of spring clamp and a plurality of copper needle, the generator passes through the wire and connects the rectifier, and the rectifier is anodal, the rectifier negative pole passes through anodal, the negative pole of wire connection impulse generator respectively, and the positive negative pole of impulse generator passes through the wire and connects a plurality of spring clamps respectively, and every spring clamp all presss from both sides on the copper needle. The utility model discloses an advantage embodies: because root tie lines worm is a little less than to electric current, voltage patience, so the electric current can kill the root tie lines worm of tobacco root fast, and can not cause the pollution to soil, the utility model discloses a human cost can have been saved to the at least 20 -30 trunk tobacco in field while insecticidal at every turn greatly to the structure of many copper pin type, has improved work efficiency.