The invention belongs to a preparation process of low-temperature sintering ceramics, and aims to solve the problem that honeycomb ceramics, which is prepared under low-temperature (lower than 600 DEG C) condition and contains titanium dioxide, has low mechanical strength. The preparation process comprises the following steps: (A) silica sol is added in the powder raw material used to prepare a honeycomb ceramic body with the weight of silicon dioxide in the silica sol occupying 5 to 30 percent of the total weight of all powder raw material; (B) the powder raw material is made into a honeycomb ceramic body blank which is put in a hydrothermal environment with the temperature ranging between 50 DEG C and 150 DEG C and the humidity more than 75 degrees for 24 hours to 120 hours; (C) the honeycomb ceramic body blank is sintered with the sintering temperature ranging from 500 DEG C to 550 DEG C and the sintering time lasting from 12 hours to 72 hours. The preparation process ensures that the honeycomb ceramics containing titanium dioxide can obtain enough mechanical strength when temperature is lower than 600 DEG C.