The invention discloses a high-vacuum sublimation purification method of 1,4-dihydroxyanthraquinone, comprising the steps of feeding, dewatering and melting, purifying by sublimation, cooling and desublimating, cooling, opening a tank, collecting, weighing, and producing a next batch. The high-vacuum sublimation purification method of 1,4-dihydroxyanthraquinone provided herein adds no other chemical materials and is free of chemical reaction or wastewater, little waste gas may be adsorbed and removed by activated carbon, qualified nuts are entrusted for the incineration of waste residue, and emission of three wastes is basically zero; compared with chemical methods and solvent methods for purification, the method has the advantages of high product purity (> / =99%), high yield (> / =97%), better environmental friendliness and zero secondary pollution; in addition, the invention also discloses a honeycomb sublimator designed according to calculus principle; compared with reactor-type sublimators, the honeycomb sublimator has the advantages that sublimation time is shortened by 5 times and higher and energy is saved by 70%.