The utility model provides a residual water blowing device of a hot-rolled plate after cooling, and belongs to the technical field of hot-rolled plates. The blowing device comprises side-blown devices and mid-blown devices; the side-blown devices are located at the two sides of laminar cooling equipment; the mid-blown devices are located at the middle part of the laminar cooling equipment, directly below a water beam and at the height of 800-1,000 mm. The residual water blowing device of the hot-rolled plate after cooling provided by the utility model has the following advantages that an existing residual water blowing system in the process of cooling after rolling is improved by adding a mid-blown system, the residual water at a steel plate surface can be thoroughly eliminated and the zone control of cooling zones can be realized; besides, the cooling evenness is improved.