One-time forming concrete outer wall groove formwork

The invention discloses a one-time forming concrete outer wall groove formwork. The one-time forming concrete outer wall groove formwork comprises a set of aluminum alloy formworks which are symmetrically arranged in parallel, concrete is filled between the aluminum alloy formworks, a metal protruding block with a rectangular section is arranged on the aluminum alloy formwork on one side, one end of the metal protruding block is located between the set of aluminum alloy formworks which are arranged in parallel, and the metal protruding block is in contact with the filled concrete. By arranging the metal protruding block, the problems that in a traditional mode that a wood box is embedded for fixing and one-time forming is adopted, a formwork in the groove is difficult to dismantle, and a concrete groove can be damaged due to violent dismantling are solved; and meanwhile, the metal protruding block is designed to slide relatively, so that the problems that the position of a groove of an existing concrete outer