Pressure vessel rust removal device

The utility model discloses a rust removal device for a pressure vessel, and relates to the technical field of rust removal devices. The device comprises a strip-shaped block, a first fixing seat is installed on the side face of the strip-shaped block, a first connecting plate is movably hinged to the interior of the first fixing seat, a second connecting plate is hinged to the other end of the first connecting plate, and one end of the second connecting plate is assembled in the strip-shaped block. When the derusting device is used, a threaded column is rotated, so that a threaded seat in threaded sleeving connection with the outer surface of the threaded column gradually slides upwards, a first connecting plate and a connecting plate are driven to gradually move towards the connected ends in the direction away from a strip-shaped block, and the end, provided with a derusting plate, of the first connecting plate is pushed to move towards the side away from the strip-shaped block; and the length of the derust