A material absorbing type dewatering dryer comprises a centrifugal dewatering machine and an air suction dryer. The centrifugal dewatering machine comprises a barrel type rack and a dewatering drum; an elevated type barrel opening is formed in the top of the barrel type rack; and the top of the elevated type barrel opening is provided with a material absorbing butt joint pipe and a rope winding tube drawing machine. The air suction dryer comprises a closed box body, a drying roller and an air suction draught fan. The closed box body is provided with a roller box bin and a hopper type storage bin, and the drying roller is sleeved with the roller box bin and provided with a roller rotating machine. According to the material absorbing type dewatering dryer, the centrifugal dewatering machine and the dryer are combined into a whole, p-hydroxybenzonic acid crystals in the centrifugal dewatering machine are conveyed into the hopper type storage bin by means of the action of airflow, the p-hydroxybenzonic acid crystals are dried in the conveying process, and the p-hydroxybenzonic acid crystals can be processed into finished products without consuming lots of time and manpower. Therefore, the material absorbing type dewatering dryer is reasonable in structure, convenient to operate and control and capable of effectively improving the production efficiency.