NOVELTY - Preparing agricultural organic waste comprises (a) composting the livestock and poultry excrement, naturally drying straw rod fragment and the livestock and poultry excrement and then mixing to prepare a dropping mixture, and (b) introducing vermiculite into a tank body mold to form a vermiculite layer, paving a screen on a surface of the vermiculite layer, passing the livestock manure mixture through a sieve to form a first dropping mixture layer, pre-fermenting the vermiculite layer and the droppings mixture layer to obtain a pre-mixture, and (c) fermenting the pre-mixture.    USE - The method is useful for preparing agricultural organic waste to plant Mexican corn (claimed) and grass.    DETAILED DESCRIPTION - Preparing agricultural organic waste comprises (a) composting the livestock and poultry excrement, naturally drying straw rod fragment and the livestock and poultry excrement and then mixing at a ratio of 1.5-4:1 to prepare a dropping mixture, (b) introducing vermiculite into a tank body mold to form a vermiculite layer, paving a screen on a surface of the vermiculite layer, passing the livestock manure mixture through a sieve having a diameter of 600-800 mu m to form a first dropping mixture layer, pre-fermenting the vermiculite layer and the dropping mixture layer at volume ratio of 1:1-3 and 25-30 degrees C until the humidity reaches 60-75% for 2-3 days to obtain a pre-mixture, (c) fermenting the pre-mixture (15-45 mg/g) and then inoculating in an earthworm tank body and then standing at 10-20 degrees C for 25-45 days in sun-shading until the humidity reaches 60-75%, adding earthworm and rotten cattle manure in the fertilizer at 10-20 degrees C for 2-30 days until the humidity reaches 60-75% to obtain pre-domesticated earthworm, and (d) passing the livestock manure mixture through a droppings mixture layer surface having a pore diameter of 600-800 mu m to prepare a second dropping mixture layer, where the first and second dropping mixture layers are present at ratio of 1-2:1, heating the second dropping mixture layer at 10-20 degrees C and for 25-40 days until the humidity reaches 60-75%, removing the screen formed on the second dropping mixture layer, adding nitrogen source containing urea (2.5-5.2 mole/m3), phosphorus source (3.2-6 mole/m3) and potassium source (0.8-1.8 mole/m3) with the first dropping mixture layer in sun shade area at 25-30 degrees C and humidity of (60-75%) for removing the earthworm.