The invention discloses a finless eel killing tool, and aims at providing the finless eel killing tool with the advantages that the operation is convenient and fast, the operation safety is high, the cost is low, and the finless eel killing tool is suitable for being applied to small-quantity finless eel killing in places such as families, dining halls and restaurants. The finless eel killing tool comprises a finless eel automatic wire mounting device and a finless eel belly opening device, wherein the finless eel automatic wire mounting device comprises a storage box, a vertical insertion plate and a plurality of wire mounters, the vertical insertion plate is arranged in the storage box, and the wire mounters are arranged on the vertical insertion plate. Each wire mounter respectively comprises an induction sleeve, a release insertion pin, a traction wire, a trigger rod, an elastic steel bar and a bait bag, the induction sleeve, the release insertion pin, the traction wire, the trigger rod and the elastic steel bar are arranged on the vertical insertion plate, and the bait bag is arranged in the induction sleeve. The finless eel belly opening device comprises a finless eel installing and clamping table and a cutting device, and the finless eel installing and clamping table comprises a support frame and a plurality of shaping elastic sleeves arranged on the top of the support frame side by side. Cutter avoiding notches are respectively formed in the top of each shaping elastic sleeve, and in addition, the cutter avoiding notches extend in the axial directions of the shaping elastic sleeves and penetrate through the two ends of the shaping elastic sleeves.