NOVELTY - An organic solid waste processing method involves crushing an organic solid waste to obtain a first material. The first material is added into an anaerobic hydrolysis acidification reactor for performing an anaerobic hydrolysis acidification treatment. The pH value of the material is adjusted to obtain a second material. The second material is added into an aerobic reactor for carrying out an aerobic composting process. When the material temperature is less than or equal to 45 degrees C, and the material is completely decomposed in the final aerobic treatment to obtain rotten compost.    USE - Method for processing organic solid waste.    ADVANTAGE - The method enables processing organic solid waste with reduced energy consumption, simple aerobic treatment, short treatment period and reduced odor.    DETAILED DESCRIPTION - An organic solid waste processing method involves crushing an organic solid waste with 40-60 wt.% water content, carbon-nitrogen with weight ratio of 20-30:1, and 20-60 wt.% organic matter content is 20-60% to obtain a first material. The first material is added into an anaerobic hydrolysis acidification reactor followed by adding microbial inoculum for performing an anaerobic hydrolysis acidification treatment at 55 degrees C, and monitoring pH value of the material. The pH value of the material is reduced, and final anaerobic hydrolysis acidification treatment is carried out. The pH value of the material is adjusted to 6.5-7.0 to obtain a second material. The second material is added into an aerobic reactor for carrying out an aerobic composting process under ventilation condition by monitoring temperature of the material, when the temperature of the material is increased with air flow to 0.10-0.20 m3/min at 50 degrees C, the ventilation amount becomes 0.05-0.10 m3/min or adopts intermittent ventilation way. When the material temperature is less than or equal to 45 degrees C, the material is completely decomposed in the final aerobic treatment to obtain rotten compost. An INDEPENDENT CLAIM is also included for a system for treating an organic solid waste.