The invention belongs to the technical field of ceramic materials, and discloses super-multielement high-entropy ceramic as well as a preparation method and application thereof. The molecular formula of the high-entropy ceramic is (HfxZryTazNbaMobWcVdTieCrf)B2, wherein 0<x<1, 0<y<1, 0<z<1, 0<a<1, 0<b<1, 0<c<1, 0<d<1, 0<e<1, 0<f<1, and x+y+z+a+b+c+d+e+f=1; The preparation method comprises the following steps: adding HfO2, ZrO2, Ta2O5, Nb2O5, MoO3, WO3, V2O5, TiO2, Cr2O3 and amorphous boron powder into an organic solvent, mixing, drying, preparing the obtained mixed powder into a green body, and keeping the temperature at 1,400-1,600 DEG C under a vacuum condition to obtain ceramic powder; introducing a protective atmosphere into ceramic powder at 1,000-1,400 DEG C by spark plasma sintering, pressurizing to 10-100 MPa, performing calcining at 1,800-2,200 DEG C, and obtaining the product. The relative density of the super-multielement high-entropy ceramic is greater than 95%, the hardness is 32-45 GPa, and the room-temperature strength is 1,000-1,500 MPa.