The invention discloses a self-locking cable hooker suspension device. The self-locking cable hooker suspension device comprises a vice jaw part, a rod part and a handle part which are connected in sequence, wherein the vice jaw part comprises a fixed vice jaw and a movable vice jaw; the rod part comprises an extension rod and a pull rod; the handle part comprises a fixed handle and a movable handle; the fixed vice jaw is fixed at the upper end of the extension rod; the movable vice jaw is articulated with the fixed vice jaw; the lower part of the movable vice jaw is articulated with the pullrod in the extension rod; the fixed handle is fixed at the lower end of the extension rod; the movable handle is articulated with the pull rod, and meanwhile, the head of the movable handle is articulated with the fixed handle; and a self-locking mechanism causing the vice jaw part to lock by itself is arranged at one end, close to the vice jaw part, of the interior of the extension rod. The self-locking cable hooker suspension device has the beneficial effects that the self-locking mechanism is driven by pinching the vice jaw part so as to cause the vice jaw part to lock by itself, so that the self-locking cable hooker suspension device can be suitable for cable hookers with different diameters; and the extension rod is adjustable in length so as to be suitable for cable steel strands different in height.