Prefabricated outer formwork of upper edge vertical concrete structure of steel beam

The utility model discloses a prefabricated outer formwork of an edge vertical concrete structure on a steel beam. The prefabricated outer formwork comprises an edge outer formwork steel plate, a reinforcing steel beam and a second impermeable layer (9). The edge outer mold steel plate comprises an edge outer mold steel plate upper part (1) and an edge outer mold steel plate bottom (2), and the edge outer mold steel plate upper part and the edge outer mold steel plate bottom are connected to form an L-shaped structure; the bottom of the edge outer mold steel plate is arranged on an upper wing plate of an edge steel beam (3) through a fixing piece (7), so that the upper part of the edge outer mold steel plate is vertically arranged above the edge steel beam, and a second impermeable layer is arranged at the joint of the bottom of the edge outer mold steel plate and the upper wing plate of the edge steel beam; the reinforcing steel beams comprise vertical reinforcing steel beams (4), and the multiple vertical r