Steel structure postwelding surface treatment robot

The steel structure post-welding surface treatment robot comprises a fixing frame, a plurality of pneumatic rods are fixedly connected to the inner top of the fixing frame, the telescopic ends of the multiple pneumatic rods are jointly and fixedly connected with a horizontal plate, and a cambered surface grinding assembly is arranged at the lower end of the horizontal plate; the cambered surface grinding assembly comprises a plurality of fixing blocks fixedly connected to the lower end of the horizontal plate, and the adjacent sides of every two matched fixing blocks are jointly and rotationally connected with a rotating shaft. According to the robot, when a pneumatic rod is stretched, two grinding balls rotate to grind a welding point, the two grinding balls can be tightly attached to an arc-shaped welding position during grinding, and meanwhile, two vertical rods rotate, so that the outer side of a welded shell can be comprehensively ground, and the interior of the shell can be ground after the shell is ove