B737NG type main undercarriage inner cylinder outer circle grinding tool

The utility model discloses a tool for grinding the outer circle of an inner cylinder of a main landing gear of a B737NG type. The tool comprises a connecting assembly, a counterweight assembly and a connecting screw rod, the connecting assembly comprises a connecting piece and two positioning plates, the positioning plates are installed at the two ends of the front face of the connecting piece respectively, positioning protruding blocks are arranged on the positioning plates respectively, the positioning protruding blocks are used for being clamped into connecting holes of connecting lugs of the main undercarriage inner cylinder in a matched mode respectively, and a fixing square block is arranged on the back face of the connecting piece. The fixing square block is used for being clamped on a four-jaw chuck of an external grinding machine, a hole is formed in the middle of the fixing square block, the hole faces the front face of the positioning plate, and the hole is used for being arranged on a protrusion