A container-type mobile house with a drainage system

A container-type mobile house (100) with a drainage system is provided. It comprises a top plate (30), a bottom plate (10), wall panels and posts (20) on the four corners for connecting the top plate and bottom plate. In which, the top plate (30) includes a top panel (34) with groove (342) and two parallel drain beams (36) for supporting the top panel, a trough (361) is set in the drain beam and through holes (362) for the discharge of water are provided in the two ends of the trough, furthermore, a drain pipe (50) for guiding the water is set under the through hole.