Arc flap gate machining device and machining method

The invention discloses an arc flap gate machining device and a machining method. The device comprises a workpiece machining platform, a plane milling machine mechanism arranged on the workpiece machining platform for slidingly mounting a plane milling tool mechanism, and a rail mechanism and a traction mechanism for moving the plane milling machine mechanism; the workpiece machining platform includes two fixed piles arranged in parallel, and a workpiece support mechanism mounted between the two fixed piles for fixing workpieces; and the rail mechanism includes two main slide rail mechanisms respectively arranged at the tops of the two fixed piles, and an auxiliary slide rail mechanism arranged on the outer side surface of one fixed pile. The invention provides the machining method of an arc flap gate capable of performing mobile repeated milling for the workpieces to be machined. The machining device mills and turns the workpieces to be machined, and realizes machining of the arc flap gate through reciprocat