The invention discloses a high temperature resistant air filtering material and a preparation method thereof. The filtering material comprises three layers, the upper and lower layers are high temperature resistant non-woven fabric layers, the middle layer is a high temperature resistant staple fiber inserted ultra-fine glass fiber non-woven fabric layer. According to the filtering material, in the production process of the glass fiber, the air flow is used for transmitting the high temperature resistant staple and distributing the staple into the ultra-fine glass fiber. After the mixing of the high temperature resistant staple and the ultra-fine glass fiber, sand blasting is used for making the two materials bonded to form a multi-dimensional, multi-sizeable and fluffy high temperature resistant staple inserted ultra-fine glass fiber non-woven fabric layer, then the ultrasonic adhesion technology is used for compounding the upper and lower surfaces of the high temperature resistant staple inserted ultra-fine glass fiber non-woven fabric layer with the high temperature resistant non-woven fabric layer. The high temperature resistant air filtering material has the advantages of being fluffy and soft, good in elasticity, high in porosity, and good in uniformity. The material prepared by using the method has good air permeability, good filtering performance, pressure resistance performance and high temperature performance, can resist ash removal vibration, is not prone to breaking which can invalidate the filtering material.