Abstract: The present invention relates to a manufacturing method of deodorized and neutralized fertilizers. The first suspension containing a large amount of basic components is prepared by adding water to the powdered basic rocks and agitating the same, while the second suspension containing a large amount of free acids of malodorants is prepared by adding water to the organic filth materials and agitating the same. The two suspensions thus prepared are then mixed together to produce a gel material due to the neutralization reactions between the basic and the acid components in the suspensions, whereby the organic filth materials are deodorized resulting in a fertilizer of enhanced fertilizability.