Pouring construction method for rectangular channel

The invention provides a pouring construction method of a rectangular channel, which comprises the following steps of: using a movable steel mould which is built on the inner side of the channel and is arranged on a sliding rail coaxially arranged in the channel in a sliding manner; the cantilevers are installed on the tops of the two sides of the door-shaped frame, the inner formwork and the outer formwork are detachably connected to the door-shaped frame and the cantilevers respectively, the end formwork is connected to the ends of the outer formwork and the inner formwork through bolts, and the outer formwork is located on the inner sides of the cantilevers and connected with the movable ends of the cantilevers through pull rods on the tops. The bottom end of the outer formwork is connected with a rolling structure capable of pushing the outer formwork to move towards the outer side of the channel, and the movable end of the rolling structure is provided with a pulley. The effects of improving the efficien