Process for preparing modified composting fertilizer

The invention discloses a process for preparing modified composting fertilizer. The process comprises the following preparation steps that a, straw is crushed into grains through a crusher; b, bird guano and the crushed straw grains are mixed and stirred in a stirrer until the interior is mixed to be uniform and the water proportion is reduced to 60% or below, and a composting mixture is obtained;c, composting fermentation strains are added to the composting mixture, and the composting mixture is laid in a composting room; d, first mechanical turning and throwing are carried out; e, second mechanical turning and throwing are carried out, air is injected into a composting room, and meanwhile the temperature in the composting room is raised to 40 DEG C through a temperature control device;f, third mechanical turning and throwing are carried out, and the temperature of the composting room is raised to 65 DEG C to 70 DEG C; g, piles are mechanically stacked and moved, the temperature isgradually reduced, and lign