Steel structure truss for road bridge engineering and building construction and construction process

The invention relates to the technical field of steel structure trusses, in particular to a steel structure truss for road bridge engineering and building construction and a construction technology, and the steel structure truss for road bridge engineering and building construction comprises a first connecting block, a second connecting block, a pre-connecting bolt, a fixing groove, a second connecting limiting groove and a first connecting limiting block; the device has the beneficial effects that a first connecting limiting block is jacked by a first connecting jacking spring to enter a first connecting limiting groove to limit and fix a pre-connecting bolt and a first connecting block, and a second connecting limiting groove and a second connecting limiting block are matched to limit and fix the pre-connecting bolt and a second connecting block; and therefore, the first connecting block and the second connecting block are pre-connected and limited, the flatness of multiple groups of truss bodies during con