The present invention relates to a method for producing tofu, and more particularly, to a method for producing tofu, wherein the beans are soaked with water from which stems, roots and leaves of a vitamin tree (sea buckthorn) Which is rich in nutrients such as vitamins and has a good taste. The above-described features of the present invention include: a step of filtering finely pulverized ilite powder and loess powder into a sieve having a mesh size of 200 mesh to form a fine powder； 1 to 2% by weight of pulverized ilite powder, 1 to 2% by weight of loess powder and 96 to 98% of clean purified water are mixed in a volume ratio and stirred evenly； A step of storing the purified water diluted with ilite and loess powder for 5 to 7 days to precipitate the powders so as to sink to the bottom； Removing stems, roots and leaves from a sea buckthorn and washing them with clean water； Stems, roots and leaves of the washed vitamins are placed in a bag of mesh and put into the water of the extraction tank and heated with a heater to extract for 6 to 8 hours while keeping the inside temperature of the tank at 55 to 65 ° C and the pressure of 200 to 500 mmHg step； Extracting the bag from the extraction tank, filtering out the water with vitamins, and finishing the vitamin tree extract； 8 to 12% by weight of vitamin tree extract, 88 to 92% by weight of illite and yellow clay, mixing cleanly washed beans into mixed water for 7 to 8 hours； Soaking the so-called beans, washing them thoroughly, putting them in a grinder, finely grinding the soybeans with water while gradually adding water, Separating the soybean milk (soybean milk) and the soybean curd (bean curd) from the soybean curd after boiling the soybean curd； When the hot bean is cooled and the temperature is maintained at 65 to 75 ° C, a coagulant is added to solidify the bean product； When the bean is solidified, the clear bean is discarded, the cloth is laid on a box in which holes are formed, and a coagulating substance
