The invention relates to a ramie fiber mattress production method which includes the steps: firstly, quantitatively feeding and carding ramie fibers; secondly, performing mesh laying, needle punching and thermoforming; finally, cutting the ramie fibers. The ramie fibers adopt modified ramie fibers, a modified method of the ramie fibers includes the steps: firstly, matching cotton seed shell ash, rice straw ash and sodium hydroxide according to the weight ratio of 10:(5-8):(1-2), adding the cotton seed shell ash, the rice straw ash and the sodium hydroxide into water with the weight accounting for 10-15 times of the total weight of the cotton seed shell ash, the rice straw ash and the sodium hydroxide, and boiling mixture to prepare modified solution; secondly, adding the ramie fibers into the modified solution, enabling the ramie fibers to be completely immersed by the modified solution, and stewing mixture for 2-4h; thirdly, taking out the ramie fibers from the modified solution, washing the ramie fibers by the aid of clear water, and naturally air-drying the ramie fibers. According to the method, characteristics such as crystallizing degree and orientation degree of the ramie fibers are changed, prodding and itching sensation is removed when the ramie fibers contact with human bodies to some extent, and unique pore cavity structures and middle ditch-shaped cavities of the ramie fibers cannot be broken, so that a prepared ramie fiber mattress keeps characteristics such as natural bacterium resistance, bacterium inhibition, odor removal, adsorption, moisture absorption, permeability, mildew resistance and abrasion resistance of the ramie fibers.