The invention discloses a T-shaped steel overturning device in order to solve the problem that labor during manual steel overturning is large in the prior art. The T-shaped steel overturning device comprises a vertically-arranged steel overturning plate which is a right trapezoid plate. One side of the bevel edge of the right trapezoid plate is arranged towards the moving direction of a conveying chain. A blocking protrusion is arranged at the upper end of the right trapezoid plate and is spaced from the upper end of the bevel edge of the right trapezoid plate. According to the steel overturning device of the structure, T-shaped steel can be well limited by the blocking protrusion on the steel overturning plate, and the limited T-shaped steel can be overturned to an ideal state through cooperation with a steel overturning plate ascending and descending driving device. The T-shaped steel overturning device is simple in structure and convenient to operate, greatly reduces manual handling labor and lowers the production cost.