The invention relates to a low-resistance-drop filtering material and a preparation method thereof, and belongs to the technical field of high temperature flue gas, porous materials and high-flux filtering materials. The material is formed by compounding a metal fibrofelt base material and a metal powder film layer attached to the surface of the metal fibrofelt base material; and the metal powderfilm layer comprises the following raw materials: a Fe-Al series intermetallic compound and/or a NiCrAlFe intermetallic compound. The preparation method of the material comprises the following steps:firstly, mixing the intermetallic compound powder with a glue solution, and fully stirring to obtain metal powder suspension liquid; secondly, spraying the surface with high filtering precision of themetal fibrofelt base material with the metal powder suspension liquid to obtain a sprayed material; and finally, drying the sprayed material and then carrying out sintering treatment to obtain the low-resistance-drop filtering material finally. By the material, the problems that flux is low, resistance drop is high, high temperature resistance and sulfur attack resistance are poor, and the structural mode is single are solved, the thickness of a spraying layer and the filtering precision are controllable, and the cost is low.