NOVELTY - Preparation of rice seedling cultivation material includes crushing cassava residue, tree mushroom waste, pig's fermentation bed, chicken's fermentation bed, cow dung and tobacco straw, stirring, and piling; fermenting, turning, monitoring moisture, turning, adding water, and turning; adding trace elements, stabilizer and active agent, mixing, fermenting, and checking pH value, nitrogen, phosphorus, potassium, density, moisture, and organic matter contents; an screening passable materials, and packaging.    USE - Method for preparation of rice seedling cultivation material (claimed).    ADVANTAGE - The method avoids environment pollution and utilizes waste raw materials. The cultivation material has good stability and fast growing effect on seedlings with high survival rate.    DETAILED DESCRIPTION - Preparation of rice seedling cultivation material comprises:    (A) crushing 65-75 pts. wt. cassava residue, 20-40 pts. wt. tree mushroom waste, 10-15 pts. wt. pig's fermentation bed, 5-10 pts. wt. chicken's fermentation bed, 2-5 pts. wt. cow dung and 2-5 pts. wt. tobacco straw, stirring, and piling;    (B) fermenting to 55 degrees C, and turning;    (C) fermenting for 1-2 months while monitoring moisture, turning when temperature reaches 55 degrees C, adding 20-40 wt.% water when moisture content is 20%, turning when moisture content reaches 40%, and reducing moisture content to 20-40%;    (D) adding trace elements comprising greater than or equal to 9 wt.% nitrogen, greater than or equal to 6 wt.% phosphorus pentoxide, greater than or equal to 4 wt.% potassium oxide and greater than or equal to 0.2 wt.% water-soluble zinc; and supplements comprising1-3 kg/m3 stabilizer and 1-2 kg/m3 active agent containing greater than or equal to 0.5% organic matter; and mixing, fermenting, and checking pH value content at 6.5-8, nitrogen content at greater than or equal to 5%, phosphorus content at greater than or equal to 3%, potassium content at greater than or equal to 2%, density at 0.2-0.3 g/cm3, moisture content at 30-40%, and organic matter content at 75-80%; adding unpassable materials with trace elements and active agent, and fermenting for 1-2 months; and    (E) screening passable materials, and packaging.