A rain-proof shed for construction in an open cut pit comprises horizontal trusses, longitudinal square steel beams and color steel tiles. The rain-proof shed for construction in the open cut pit is characterized in that the longitudinal square steel beams which are evenly arrayed are welded on the tops of the horizontal trusses which are arrayed evenly; the longitudinal square steel beams are perpendicular to the horizontal trusses; the color steel tiles are fixedly mounted on the longitudinal square steel beams; the horizontal trusses are supported by open cut pit concrete supporting beams; screw holes are formed in the horizontal trusses; one ends of hooks are connected with the screw holes in the horizontal trusses; and the other ends of the hooks are wound on the open cut pit concrete supporting beams. According to the rain-proof shed for construction in the open cut pit, the color steel tiles are used as the roof of the rain-proof shed, the integrity of the roof of the rain-proof shed is improved, the requirement for the use function of foundation pit construction is met, the probability of sunstroke of operating personnel during hot weather in summer can be lowered, and the safety of personnel and equipment in rainy days can be guaranteed.