Polished rod salvaging device used in oil field

The utility model relates to a tool for downhole operation, in particular to a polished rod fishing device used in an oil field. The technical scheme thereof is that the device mainly comprises a fisher body, a marble, a neck bush and a rod-shaped falling object; a tapered surface is arranged in the inner cavity of the fisher body; the neck bush is arranged on the bottom part of the fisher body; the marble is arranged in a marble groove on the neck bush; a spring is arranged at the lower end of the marble groove; and the marble is connected with the lower end of the marble groove through the spring. The device has the beneficial effects that the marble can fall in time through the pulling and shrinking of the spring, the falling object can be jammed timely, thereby fishing the rod-shaped falling object successfully; and the operation success ratio is high, and the operation cost is saved.