The utility model discloses a steering drop arm dismounting device, its characterized in that: it includes the cassette, is equipped with the bolt fastening seat of through -hole and nut, is used forthe driving bolt to firmly turning to quick -witted output shaft, quick -witted plumbing arm spliced pole joint complex U type groove is equipped with and turns to on the cassette, cassette upper endsymmetry is equipped with two connecting rods, bolt fastening seat fixed connection is between two connecting rods, the through -hole communicates with the screw hole of nut, driving bolt and nut andthreaded connection, and the through -hole is passed to driving bolt's bottom. The utility model discloses a transmission of power realizes steering drop arm's dismantlement work, and the operation issimple and easy, has not only practiced thrift the manpower, improves production efficiency greatly, more avoided having prolonged steering drop arm's life dismantling the damage of in -process to steering drop arm, and be applicable to multiple type and size turn to the arm dismantlement work, its commonality is strong, simple structure, low in manufacturing cost, easily popularization.