Temporary flashboard suitable for large-scale sewage pipeline plugging construction

The utility model relates to a temporary flashboard suitable for plugging construction of a large-scale sewage pipeline. The temporary flashboard comprises a grating steel frame and a steel baffle, and the lower portion of the steel baffle is cut into an arc shape with the radian the same as that of the lower portion of a to-be-blocked pipeline. The grating steel frame is a profile steel grating support which is formed by welding channel steel and is the same as the steel flashboard in shape, and a plurality of supporting pieces are arranged on the rear side of the grating steel frame. The arc-shaped part of the grating steel frame is downwards arranged at the joint of the pipeline to be blocked and the existing working well through the existing working well of the large sewage pipeline; aplurality of supporting pieces are fixed to the wall of an existing working well through a plurality of supporting pieces on the rear side of the grating steel frame, and the steel baffle is fixed tothe upstream face of the