Anticorrosion packer of reinjection well casing pipe

The utility model provides an anticorrosion packer of a reinjection well casing pipe. The anticorrosion packer comprises an upper joint, a central pipe, a balance joint, a guide ring, a rubber sleeve, an oil draining sleeve, a releasing jaw, an upper piston sleeve, an upper piston, a lower piston, an outer central pipe, a cylinder barrel, a lock ring check ring, an upper conical body, a slip, a slip sleeve, a lower conical body, a bush and a lower joint. Two kinds of rubber barrels are adopted in the packer, through a main and auxiliary sealing combination mode, an auxiliary seal carries out sealing and meanwhile supports and protects a main seal which plays an important role, the double-direction whole slip ensures setting stability, it is ensured that setting of the packer is stable and reliable, the packing effect of the packer is improved, and the service life is prolonged.