The invention provides a method for producing gradient porous ceramics by taking straw as a pore-forming agent. The method comprises the following steps: weighing 45 to 48 parts of kaolin, 13 to 16 parts of commercial alumina and 36 to 42 parts of talcum in parts by weight, adding water for mixing, stirring, drying and sieving to obtain mixed powder, and equally dividing the mixed powder into three parts; drying and grinding the straw, and then separately sieving with a 80-mesh sieve, a 150-mesh sieve and a 200-mesh sieve, separately mixing a total of 12 to 48 parts of three kinds of straw powders different in particle size with the equally divided mixed powder well and pressing into a green body, and drying and firing the green body. According to the method provided by the invention, a new utilization way of crop straw is developed, pollution of straw burning to the environment is relieved, and meanwhile, production cost of a porous ceramic material product is reduced; the produced gradient porous ceramics is high in apparent porosity, relatively low in volume density and relatively high in breaking strength and fire resistance temperature.