The invention provides sugar-free Changchun longevity granules and a preparation method thereof. The granules comprise radix asparagi, radix ophiopogonis, prepared rehmannia roots, Chinese yam, twotooth achyranthes roots, radix rehmanniae, folium cortex eucommiae, prepared fleeceflower roots, poria cocos, Chinese ginseng, radix aucklandiae, semen platycladi, fructus schizandrae, woodwardia japonica, wild pepper, acorus tatarinowii, grilled polygala roots, semen cuscutae, rosa laevigata michx, fructus lycii, fructus rubi, cortex lycii radicis, rhizoma alismatis powder and a corrigent. The preparation method comprises the following steps: firstly, extracting radix asparagi, radix ophiopogonis, prepared rehmannia roots, Chinese yam, twotooth achyranthes roots, radix rehmanniae, folium cortex eucommiae, prepared fleeceflower roots, poria cocos, Chinese ginseng, radix aucklandiae, semen platycladi, fructus schizandrae, woodwardia japonica, wild pepper, acorus tatarinowii, grilled polygala roots, semen cuscutae, rosa laevigata michx, fructus lycii, fructus rubi, and cortex lycii radicis by using water, so that clear paste is obtained; then, mixing the clear paste, rhizoma alismatis powder and corrigent; and granulating and drying the obtained mixture. The granules prepared according to the method provided by the invention do not contain sugar, thereby enlarging the applicable people; the granules are simple in preparation process, controllable in quality, and convenient to take and carry; and the application amount of auxiliary materials is only 5% of that of a soft extract, so that the cost is greatly reduced.