Support capable of guaranteeing butt joint precision

The utility model discloses a support for ensuring butt joint precision, which comprises a tough thin iron support and a butt joint assembly, a rectangular frame is arranged below the tough thin iron support, and the butt joint assembly is arranged in the rectangular frame. According to the support capable of guaranteeing the butt joint precision, through the rectangular frame, the butt joint assembly and the smooth layer, an operator can directly observe the connection condition of the joint of two reinforced concrete rainwater pipes, then the positions of the two reinforced concrete rainwater pipes are adjusted, and therefore it is guaranteed that the butt joint precision of the two reinforced concrete rainwater pipes is accurate; a limiting long rod, a first threaded hole body, a rectangular groove long rod and a second threaded hole body are lengthened, an operator can conveniently connect a plurality of tough thin iron supports, the device can wrap, limit and support reinforced concrete rainwater pipes o