The invention relates to the fields of materials of the aerospace industry, the metallurgical industry and the mechanical industry and processing technologies thereof, in particular to a sealed pore structure ceramic coating and a preparation technology thereof. The sealed pore structure ceramic coating and the preparation technology thereof aim to solve the problem that in the prior art, sealed pores are unsteady and prone to be communicated with one another to form a communicated pore structure. The preparation technology of the sealed pore structure ceramic coating comprises the following steps that 1, ZrO2 or Al2O3 ceramic powder of a hollow porous structure with the center hollow portion with the volume percentage of 50%-80% is subjected to a plasma spraying method to prepare a ceramic coating; 2, at 0.1-0.5 MPa, Zr(OH)4 or Al(OH)3 ceramic colloid pressure infiltration is conducted; 3, heat treatment is conducted on the ceramic coating after pressure infiltration. Pores in a prepared ceramic layer are sealed pores, the porosity is 5%-30%, and the thermal conductivity is 0.6-1.2 W/m.K, which is lower, so that the thermal insulation effect is effectively improved.