Strong magnetic fishing, grinding and milling combined device suitable for horizontal well

The invention discloses a strong magnetic fishing, grinding and milling combined device suitable for a horizontal well. The strong magnetic fishing, grinding and milling combined device comprises a fishing body. A connector is arranged at the front part of the fishing body, and a main body at the tail part of the fishing body is of a double-side concave cambered surface fishing groove structure, namely a first cambered surface fishing groove and a second cambered surface fishing groove; salvage magnetic parts are arranged in the middles of the first cambered surface salvage groove and the second cambered surface salvage groove, and a milling part is arranged at the tail of the salvage body. The fishing magnetic component is arc-surface magnetic steel, the arc-surface magnetic steel located on the fishing body is divided into a plurality of short-size arc-surface magnetic steel, and the plurality of short-size arc-surface magnetic steel is arranged to prevent the arc-surface magnetic steel from being broken du