Cooling device used for rolling aluminum alloy medium-thick plate at differential temperature

The utility model relates to a device used for rolling plates, in particular to a cooling device used for rolling an aluminum alloy medium-thick plate at differential temperature, and aims to solve the technical problems that in the prior art, deformation of an ultrahigh strength aluminum alloy thick plate is difficult to penetrate into the inner portion in a rolling primary stage, structure property of the surface and the center portion is seriously uneven, size of a rolling mill and increase of rolling reduction of a single channel time are hard to break through and the like. The cooling device used for rolling the aluminum alloy medium-thick plate at the differential temperature comprises a roller way (1) and is characterized in that spray devices are arranged above and below the roller way (1), each spray device comprises a support(2) which is provided with a plurality of nozzles (3), an dip angle between each nozzle and the vertical direction is 10-20 degrees, and the nozzles are respectively dipped to t