The utility model relates to a rigid-framed shed tunnel with a special-shaped top plate structure, belongs to the technical field of railway civil engineering and solves the problem that maintain rockfall is liable to occur at a skew tunnel portal so as to endanger the personnel safety. The rigid-framed shed tunnel with the special-shaped top plate structure comprises a supporting structure and a top structure. The supporting structure comprises an inclined rigid frame slantingly arranged across a railway line, and a longitudinal rigid frame arranged along the line; the inclined rigid frame as well as the longitudinal rigid frame comprises by two vertical frame columns and a frame beam; grooves are formed in the frame beams of both the inclined rigid frame and the longitudinal rigid frame; the top structure comprises a top plate and top beams; and the top beams are arranged in the grooves in the frame beams. The shed tunnel disclosed by the utility model not only can bear the dead weight, but also can bear the dead load of filled earth on the top of the tunnel and the impact load of falling rocks.