One-step formed aluminum alloy formwork for drainage and slope finding of concrete cantilever slab

The utility model discloses a concrete cantilever plate drainage slope finding one-time forming aluminum alloy formwork which comprises a plurality of peripheral standard plates, the peripheral standard plates are arranged in the vertical direction, the cross section of each peripheral standard plate is in a U shape, notches of the peripheral standard plates face outwards, the peripheral standard plates define an inner-layer combination body and an outer-layer combination body, and the inner-layer combination body and the outer-layer combination body are arranged in a staggered mode. A U-shaped main body cavity is formed between the inner-layer combination body and the outer-layer combination body, the cross section of the inner-layer combination body and the cross section of the outer-layer combination body are both in a U shape, a transverse slot is formed in the inner side wall of the inner-layer combination body, and a special-shaped corner plate and a standard corner plate are fixedly connected to the up