The invention discloses a tough tofu producing method and tough tofu. The tough tofu producing method comprises the steps of: 1) adding a tough tofu coagulator with weight percent of 0.4-0.8 into soybean milk at the temperature of 80-85 DEG C, wherein the tough tofu coagulator consists of the following components in percentage by weight: 50-70 percent of rice milk leavening product, 15-24 percent of calcium sulphate, 14-23 percent of gluconic-acid-gamma-lactone and 1-3 percent of glutamine transaminase; and the rice milk leavening product is formed by the steps of: 11) adding 5-10 percent (W/W) yeast bacteria and 5-10 percent (W/W) lactic acid bacillus strain into milk with the particle size of 80-120 meshes and the solid content of 50-80 percent (W/W), 12) fermenting the milk at the temperature of 25-30 DEG C for 3-5 hours to obtain a fermented semi-finished product, and 13) drying the fermented semi-finished product until the moisture content is less than 8 percent (W/W), and smashing the fermented semi-finished product until the particle size is 80-120 meshes, thus preparing the rice milk leavening product; 2) uniformly stirring the tough tofu coagulator and the soybean milk, and standing for 5-10 minutes; and 3) putting the mixture into a die, and squeezing to obtain the tough tofu. The toughness of the tofu produced by the method is greatly improved; the tofu is difficult to smash during frying; the taste of the tofu is better than that of the general tofu; and the tofu is suitable for storage and long-distance transportation.