NOVELTY - Preparing rice-wheat straw organic fertilizer comprises e.g. smashing the rice-wheat straw to a length of 1 cm of small rice and wheat straw powder stick particle, adding river mud into the river mud sedimentation tank for precipitation treatment, extracting surface water, adding rice-wheat straw stick particle in river mud, stirring rice-wheat straw and canal mud, mixing rice-wheat straw particle and canal mud, adding livestock and poultry dung, mixing uniformly, adding in pool, sealing, soaking to prepare foam product, detecting organic substance content of foam product.    USE - The method is used for preparing rice-wheat straw organic fertilizer (claimed).    ADVANTAGE - The method is simple and easy to prepare organic fertilizer with high organic matter content, and nutrition; produces large amount of active substance good for plant growth and nutrition absorption, and supplies comprehensive nutrition for crop. The fertilizer has longer fertilizing effect, can improve soil organic matter, promotes microorganism breeding, improves the physical and chemical property and biological activity of soil.    DETAILED DESCRIPTION - Preparing rice-wheat straw organic fertilizer comprises (i) smashing the rice-wheat straw to a length of 1 cm of small rice and wheat straw powder stick particle, (ii) adding river mud into the river mud sedimentation tank for precipitation treatment, extracting surface water, (iii) adding rice-wheat straw stick particle in river mud, stirring rice-wheat straw and canal mud at weight ratio of 7:3, (iv) mixing rice-wheat straw particle and 100 pts. wt. canal mud particle, adding 15 pts. wt. livestock and poultry dung dirt and mixing uniformly, adding in pool, then sealing pool, soaking for 30 days to prepare foam product, pool heating, maintaining pool temperature as 90-100 degrees C, lasting for 4-6 days and stop heating, (v) detecting organic substance content of foam product, total nutrient content and free water content, where the total nutrient includes nitrogen, phosphorus pentoxide and potassium oxide, (vi) according to detecting data, adding rice-wheat straw stick and activated coal powder and humus, in each part of foam product, adding 0.001 pts. wt. fermented fungus and 0.001 pts. wt. leavening agent, where the processing standard is as follows: free water is less than 30%, organic matter content is less than or equal to 20%, (vii) adding the rice-wheat straw stick, activated coal powder, humus, after fermented fungus and leavening agent and stirring uniformly into fermentation material, (viii) fermentation of organic fertilizer for deep fermentation type stacking for fermentation, detecting temperature of fermentation material each day, using fermentation material temperature 2 days and raising to 50 degrees C, after fermenting for 3 days, spraying every 2-3 times, maintaining fermentation temperature at 50-70 degrees C, turning once after fermentation for every 2-3 days, (ix) detecting organic substance content of fermented product, total nutrient content and free water content, the total nutrient including nitrogen, phosphorus pentoxide and potassium oxide, (x) modulating: according to data of the second time detection, modulating the fermentation product, to guarantee each index of the fermentation product after modulation reaches the following standard: (a) organic matter content is less than or equal to 30%, (b) total nutrient less than or equal to 4%, (c) free water is less than or equal to 20%, (d) at pH 5.5-8, (e) organic fertilizer and heavy metal content, ascarid eggs death rate and Escherichia coli value index meets GB8172 standards, (f) sniffing determination, (xi) pelletizing: using organic fertilizer granulator to pelletize fermentation product, then drying, and screening, (xii) after granulaton, granular product, before packing at ratio of 1/1000 is mixed with functional bacteria, and (xiii) adding granular product and functional bacteria mixture in film woven bag or plastic woven bag lined with polyethylene, bag packaging, and storing at shady place to dry.