The invention discloses a reinforced steel structure load-bearing beam. The reinforced steel structure load-bearing beam comprises T-shaped sleeve plates, a bottom plate, a first transverse plate, a second transverse plate and vertical plates, wherein the bottom of each vertical plate penetrates through each T-shaped sleeve plate and extends to an inner cavity of each T-shaped sleeve plate; two sides of the front surface and two sides of the back surface of the top of the bottom plate are respectively fixedly connected with the bottoms of the T-shaped sleeve plates by virtue of limiting pins;and the two T-shaped sleeve plates are fixedly connected with the two sides of the first transverse plate by virtue of connecting plates. The invention relates to the technical field of steel load-bearing beams. By adopting the reinforced steel structure load-bearing beam, a good reinforcement effect can be achieved by virtue of a simple and easy-to-operate structure, a good buffering and dampingeffect can be achieved, a good use effect can be achieved, the use by people can be facilitated, the safety performance in the building process can be greatly improved, an effect for facilitating theheight adjustment of the load-bearing beam can be achieved, an effect for facilitating the disassembly of the reinforced structure can be achieved, and the utilization rate of building materials can be greatly increased.