The utility model relates to a T-shaped beam maintenance device. The device comprises a plurality of maintenance assemblies connected by movable diagonal bracings, the maintenance assembly comprises adoor-shaped frame and two rectangular frames, wherein each rectangular frame is defined by two horizontal pipes and a vertical pipe, and one end of each rectangular frame is open. The door-shaped frame comprises vertical rods and a cross beam connected with the top ends of the two vertical rods, the open end of the rectangular frame is connected to the middles of the inner sides of the vertical rods, the door-shaped frame and the rectangular frame are both made of hollow pipes, and spray heads are distributed on the hollow pipes. The T-shaped beam maintenance device is convenient to move andoperate, can be flexibly folded and unfolded, can be used for uniformly spraying and maintaining a T-shaped beam without dead angles, and is high in maintenance operation efficiency.