Lower support bracket of large-span truss

The utility model relates to a large-span truss lower support bracket, and relates to the technical field of building supporting structures, the large-span truss lower support bracket comprises a steel pipe concrete column, a bracket structure and a reinforcing structure, the bracket structure is fixedly arranged on the steel pipe concrete column, and the bracket structure comprises an inclined plate inclining outwards and upwards, a mounting plate used for mounting a support and two parallel vertical plates; the mounting plate is horizontally arranged on the steel pipe concrete column, the two vertical plates are fixedly connected with the two ends of the inclined plate and the two ends of the mounting plate respectively, the inclined plate is located below the mounting plate, the reinforcing structure comprises a first stiffening plate, and the first stiffening plate is located between the two vertical plates and fixedly connected with the inclined plate and the mounting plate respectively. The bracket stru