The invention discloses a flexible assembly device for bridge T steel and its implementation method, which includes self-locking universal wheels, the self-locking universal wheels are installed at the lower end of the support plate, and the first clamping rod is opposite to the second clamping rod The supporting mechanism, and the first clamping rod and the second clamping rod are respectively arranged on the upper end of the supporting plate, and the side of the first clamping rod and the second clamping rod is arranged on the upper end of the supporting plate, and the T-shaped angle clamp of the T-shaped steel It is held between the first clamping rod, the second clamping rod, the first blocking rod and the second blocking rod, and the upper end of the support plate between the second blocking rod and the first blocking rod of different groups is provided with a clamping piece , between the clamping piece and the adjacent T-shaped steel, there is a reinforcing block assembly, the structure of the assembly equipment is simple, the manufacturing cost is low, it can be mass-produced, it is easy to promote, easy to move, small footprint, easy to transport, and assembly The speed is fast, the physical exertion of the operator is low, and 2-5 pieces of T-shaped steel can be assembled flexibly according to the demand. When the assembly demand is large, multiple assembly equipment can be set up.