Automatic unhooking device suitable for submersible sewage pump

The utility model discloses an automatic unhooking device suitable for a submersible sewage pump, and relates to the technical field of rain sewage pump stations. The device comprises an L-shaped positioning frame, two positioning ropes and a lifting hook assembly, wherein the L-shaped positioning frame sinks into water and is attached to one side of a pump lifting lug; the bottom ends of the two positioning ropes are symmetrically tied and fixed to the left side and the right side of the L-shaped positioning frame; the upper ends of the two positioning ropes are wound on positioning rope automatic recovery wheels on the corresponding sides respectively; the locking rod is vertically arranged on the L-shaped positioning frame, an h-shaped groove is formed in the top of the locking rod, the hook tightening mechanism is horizontally installed on the L-shaped positioning frame, and the two unhooking tension springs and the two hook triggering rods are fixed to the left side and the right side of the hook assembl