The invention discloses a method for quickly preparing a soil conditioner with municipal sludge. The method includes uniformly mixing raw materials including domestic sludge, rice straw, livestock and poultry manure, heavy metal passivator and microorganism bacterium agent to obtain mixed material; subjecting the mixed material to high-temperatureaerobic fermentation with a multi-layer vertical mixing and turning fermentation tower to obtain fermented material; subjecting the fermented material to granulation prior to low-temperature drying to obtain the soil conditioner. With the method, stabilized, harmless, reducing and resourceful treatment of sludge is realized, sludge can be prepared into the soil conditioner capable of heightening soil quality and improving plant growth, preparation cost is low, the device is small in floor area, full-automatic control in process can be realized, and industrial production is facilitated.