The invention belongs to the field of underground engineering, and particularly relates to an automatic cleaning type underground engineering construction sewage discharge device, which comprises a storage box and a cylindrical collection box, wherein the storage box is communicated to the collection box through a sewage discharge port, a water inlet pipe is arranged at the upper end of the collection box, a water discharge pipe is arranged at the side wall of the collection box, a liner with an opening end is rotationally connected in the collection box in a sealed mode, and is fixedly connected to a partition plate in the axis direction of the liner, the liner is divided into an upper water discharge cavity and a lower water discharge by the partition plate, circulating holes are formedin the positions, corresponding to the water inlet pipe, of each water discharge cavity, filtering plates are connected in each water discharge cavity in a sliding and sealing mode, and are perpendicular to the axis direction of the liner, a counterweight roller is rotationally connected to the outer side wall, away from the opening end, of the liner, and a connecting strip is wound around the counterweight roller. According to the invention, by arranging the upper water discharge cavity and the lower water discharge cavity, water can be conveyed alternately, and the sewage discharge pipe is not required to be closed during impurity cleaning, so that the non-stop operation can be achieved, and the sewage discharge efficiency can be greatly improved.