The invention discloses a black matt impregnated rubber and a preparation method. The invention solves the problems that the current brake sheet primer has poor high temperature stability, short preservation time and poor manufacturability, the color can not meet black matt, and the ingredients are easy to be layered. The black matt impregnated rubber is composed of single packaged ingredients of A and B; the A ingredient consists of a molybdenum modified thermosetting phenolic resin solution, thermoplastic phenolic resin, butadiene-acrylonitrile rubber, polyvinyl acetal, coloring agent, delustering agent, sulphur and organic solvent; the B ingredient consists of a curing agent and organic solvent. The method of the invention comprises the following steps: 1, the butadiene-acrylonitrile rubber and the polyvinyl acetal are respectively dissolved in the organic solvent, then the mixture is evenly mixed with the molybdenum modified thermosetting phenolic resin solution, the thermoplastic phenolic resin, the coloring agent and the delustering agent to prepare the ingredient A; 2, the curing agent is dissolved in the organic solvent to obtain the ingredient B. The black matt impregnated rubber has good high-temperature stability, long preservation time, good manufacturability and even ingredients.