The utility model discloses a special methanol washing device for a urea synthesis workshop. The special methanol washing device mainly comprises an H2S concentration tower, a CO2 stripping tower, anacid gas water washing tower, a CO2 regeneration tower, a methanol-water separation tower, a thermal regeneration tower, a sulfur-rich methanol flash tank, an acid gas water cooler and a tail gas separation device, wherein the acid gas water washing tower is connected with the thermal regeneration tower, the acid gas water washing tower is connected with the H2S concentration tower, a connecting pipeline is additionally arranged between the acid gas water washing tower and the H2S concentration tower, and an electromagnetic valve is arranged on the pipeline; according to the utility model, thenew acid gas water scrubber and an original pipeline before technical improvement are utilized, the flow of carbon dioxide-rich methanol entering the H2S concentration tower and the acid gas water scrubber is adjusted and balanced by a bypass, and finally, the carbon dioxide desorption of the two towers reaches the optimal balance point, so that the methanol entrainment amount of the product gascarbon dioxide is greatly reduced.