A process for effectively treating garbage without pollution includes such steps as drying and breaking the deodouring chemical, mixing with calcium lime, adding the mixture to the garbage, crushing,mixing uniformly by stirring to obtain fertilizer, and purifying and dischaging the odour from the fertilizer by a deodouring equipment. Its installation is composed of fertilizer-preparing unit and deodouring equipment. Its advantages include small occupied ground area, the installation able to be mounted on a truck, high efficiency and no pollution to atmosphere.