The invention relates to a drying method of chemical hydroxide aluminium, which is characterized in that the method comprises the following steps: drying a hydroxide aluminium filter cake by taking two cuniform hollow blade driers connected in series; firstly taking a primary cuniform hollow blade drier to pre-dry the hydroxide aluminium filter cake till the water weight content drops below 4%; taking a secondary cuniform hollow blade drier to directly dry the hydroxide aluminium materials which are pre-dried by the primary cuniform hollow blade drier into qualified products. Compared with traditional drying techniques, the method of the invention has dramatic advantages that when the productivity is the same, the investment can be saved by 20%, the energy consumption decreases by 68%, the equipment usage quantity decreases by 70%, the floor space decreases by 25%; the energy can be completely recycled and production is clean; the processing pipe networks, electric and automatic control systems are very easy; the system features high stability in continuous running and the automatic control can be realized conveniently, etc.