Removable plate type evaporator of large -scale modular, including modularization evaporation unit, connected material distributor pipe, the material collecting pipe, steam distributor pipe and comdenstion water collecting pipe, install at the material distributor pipe, material on the collecting pipe advances, the export is taken over, the steam inlet who installs on steam distributor pipe and comdenstion water collecting pipe takes over and the comdenstion water takeover, on a plurality of modularizations evaporation unit end to end and its, the lower extreme is installed respectively last, after down on the tube sheet, the horizontal direction is stepped up to design position and double -layered tightly to the design size with horizontal main tie by the fixed clamp board of placing down the tube sheet both ends in and active clamped plate, the vertical direction is used and is erected in the tie rod take -up, lower tube sheet and to the design size. The utility model discloses both having increased separate unit evaporimeter handling capacity, and having realized that the size was adjustable, the handling capacity scope reaches 200th - 3000th, need not again to save research and development time and equipment cost to the new slab of large -traffic development.