The invention relates to a barium titanate doped modified lanthanum zirconate ceramic material and a preparation method thereof. The barium titanate doped modified lanthanum zirconate ceramic materialis prepared as follows: (La1-xYx)2(Zr0.7Ce0.3)2O7 precursor powder is synthesized by a solid phase reaction method, and BaTiO3 is added for secondary ball milling, pressing, forming, and sintering at1600 DEG C to obtain the uniform dense barium titanate doped modified lanthanum zirconate ceramic material with low thermal conductivity and high bending strength. The barium titanate doped modifiedlanthanum zirconate ceramic material is obtained by using Y and Ce to replace for synthesizing a precursor with a specific chemical composition ratio on the basis of a lanthanum zirconate material with low thermal conductivity, and adding the BaTiO3 for sintering at high temperature. The process is simple. The obtained ceramic material has high sintering density. The bending strength is increasedby 65%-227%; the thermal conductivity is between 1.20-1.50W.m<-1>.K<-1>. The barium titanate doped modified lanthanum zirconate ceramic material can play the role of heat insulation protection in travelling wave tube collectors, gas turbine and other devices, and extends the service life of the devices.