The invention provides a method for preparing high-closed-porosity zirconium oxide-aluminium phosphate ceramic. The method is characterized by including the following steps that (1), aluminium dihydrogen phosphate and aluminium nitrate are dissolved in water, and a solution is prepared; (2), the prepared solution is dropped onto the surface of porous zirconium oxide ceramic at room temperature till the porous zirconium oxide ceramic achieves adsorption saturation; (3), the porous zirconium oxide ceramic on which the mixed solution is adsorbed is dried at the temperature of 50 DEG C; (4), a dried product is heated to 1,150 DEG C in the atmosphere and subjected to heat preservation for 2 hours, then the dried product is cooled to 800 DEG C at the speed of 5 DEG C/min and subjected to heat preservation for 2 hours, finally the product is naturally furnace-cooled to room temperature, and the high-closed-porosity zirconium oxide-aluminium phosphate ceramic is prepared, wherein the open porosity is not higher than 10% and the closed porosity is 39% to the maximum degree.