NOVELTY - Preparing paddy soil conditioner comprises (i) introducing bamboo, wood and charcoal, in the combustion furnace and combusting, (ii) weighing straw and biogas, mixing biogas residue with the chopped straw residue and fermenting, (iii) weighing soybean residue and corn residue, mixing, sealing in a cylinder, adding water, confining, removing and drying, and (iv) mixing e.g. silicate, alum, Bacillus subtilis powder, fulvic acid, chlorogenic acid, sand, fertile soil , bamboo wood ash, corn residue fat, diatom mud, fine silica powder, stirring in a ball mill, grinding, and sealing.    USE - The method is useful for preparing paddy soil conditioner (claimed).    ADVANTAGE - The method: uses cheap raw materials; and is simple. The soil conditioner: improves paddy field soil quality; has excellent fertilizer and moisturizing effect; leads to slow release in soil fertility; water irrigation can be avoided; and provides large amount of soil nutrients.    DETAILED DESCRIPTION - Preparing paddy soil conditioner comprises (i) mixing 30 wt.% bamboo, 35 wt.% wood and 35 wt.% charcoal, introducing in the combustion furnace for full combustion, obtaining the product after burning wood to ash and keeping aside, (ii) weighing 10 pts. wt. straw and 8 pts. wt. biogas, mixing biogas residue with the chopped straw residue and fermenting for 30-40 days to obtain biogas humic fertilizer, (iii) weighing 5 pts. wt. soybean residue and 5 pts. wt. corn residue, mixing, sealing in a cylinder, adding 50 pts. wt. water, confining for 30 days, removing and drying to obtain grain slag fertilizer, (iv) weighing 25 pts. wt. silicate, 6 pts. wt. alum, 10-20 pts. wt. B. subtilis powder, 15 pts. wt. fulvic acid, 10 pts. wt. chlorogenic acid, 15 pts. wt. straw decomposing agent, 8 pts. wt. sand, 8 pts. wt. fertile soil , 8 pts. wt. bamboo wood ash, 8 pts. wt. nitrogen-fixing bacteria powder, 55 pts. wt. biogas rot straw manure, 35 pts. wt. corn residue fat, 15 pts. wt. diatom mud, 25 pts. wt. fine silica powder, mixing and stirring in a ball mill, grinding to obtain 350-400 mesh fineness, and sealing in plastic bag to store for more than a week.