NOVELTY - Converting organic household food waste, comprises (a) performing solid-liquid separation by dehydrating the food waste, crushing, and then introducing dehydrated waste liquid into a waste liquid purifying groove, (b) treating solid waste by introducing the crushed solid waste into fermenting machine, adding an microorganism, regulating water content, deodorizing and fermenting, decomposing to obtain biological organic primary fertilizer, and again fermenting to obtain organic fertilizer, and (c) treating waste liquid by adding an microorganism, and converting into e.g. foliar fertilizer.    USE - The method is useful for converting organic household food waste into an organic fertilizer.    ADVANTAGE - The method: treats the organic household food waste before they become rotten, thus the waste is turned into biological organic primary fertilizer; reduces the intermediate links of the rubbish in the whole process; and treats the organic household food waste on the spot in a harmless manner.    DETAILED DESCRIPTION - Converting organic household food waste, comprises (a) performing solid-liquid separation by dehydrating the organic household food waste through a dehydrating platform, crushing the dehydrated solid waste with a crushing machine, and then introducing the dehydrated waste liquid into a waste liquid purifying groove, (b) treating solid waste by introducing the crushed solid waste into a fermenting machine, adding at least one microorganism, regulating the water content of the solid waste under the condition of humidity of 55-65%, deodorizing and fermenting, decomposing for 120-150 hours to obtain biological organic primary fertilizer, and secondarily fermenting by windrowing/storing compost to obtain organic fertilizer, and (c) treating waste liquid by adding at least one microorganism into the dehydrated waste liquid, removing the oil and purifying, and then converting the treated waste liquid into foliar fertilizer or discharging into a sewer line. An INDEPENDENT CLAIM is also included for an organic household food waste treating device comprising a dehydrating platform for dehydrating the organic household food waste, a crushing machine for crushing the solid waste, a waste liquid purifying groove for containing the waste liquid and a fermenting machine for fermenting the solid waste, where the crushing machine is placed below the dehydrating platform, the solid waste outlet of the dehydrating platform is connected with the feed port of the crushing machine and the waste liquid outlet of the dehydrating platform is connected with the inlet of the waste liquid purifying groove.