NOVELTY - An in-situ reducing method for residential kitchen garbage, involves using residential kitchen garbage as processing material, mixing residential landscape garbage/kitchen garbage uniformly, feeding materials in sealed composting reactor, mixing uniformly, modulating mixed materials till the water content is 50-65%, the carbon-nitrogen ratio is 20:1-35:1 and the pH value is 6.5-8.5; starting and carrying out the reaction: adding naturalized microorganism active substrate as microorganism resource for starting the composting, ventilation/deodorization, and feeding and discharging.    USE - As an in-situ reducing method for residential kitchen garbage (claimed).    ADVANTAGE - The method provides low energy consumption, low cost, high processing efficiency, low floor area, significant reduction effect, so that the method not only realize the recirculation of waste but also is beneficial for releasing the processing pressure of domestic garbage.    DETAILED DESCRIPTION - An in-situ reducing method for residential kitchen garbage, involves (1), collection of materials: using the residential landscape garbage as dry basis auxiliary material, using the residential kitchen garbage as the processing material, mixing the residential landscape garbage and the residential kitchen garbage uniformly, feeding the materials in a sealed composting reactor, mixing uniformly, where the mixing ratio of the landscape garbage and the residential kitchen garbage is 0.5:1 to 4:1 according to volume; (2), material modulation: modulating the mixed materials till the water content is 50-65%, the carbon-nitrogen ratio is 20:1-35:1 and the pH value is 6.5-8.5; (3), starting and carrying out the reaction: adding the naturalized microorganism active substrate as microorganism resource for starting the composting, carrying out the reduction treatment by the intermittent type aerobic dynamic composting, where the designed remaining time of the compositing is one week; (4), ventilation and deodorization: exhausting the sealed composting reactor by an exhaust fan to form negative pressure, thus realizing the ventilation and aerobic condition of the materials, and processing the exhausted waste gas (odor) by an active carbon filter pool into qualified gas, and then exhausting; and (5), feeding and discharging: feeding and discharging at fixed periods every day, screening the discharged material, reflowing the material-on-the-screen containing rich micro-organism colony back to the composting reactor, thereby performing the in-situ reduction of the residential kitchen garbage successively and efficiently.