NOVELTY - Preparing composite micro-ecological microbial inoculum to remove farm smell, comprises e.g. adding lactic acid bacteria, nitrobacteria, Bacillus in a weight ratio of 2:1:1 in bacteria culture medium, culturing at 28 degrees C by shaking table under rotating speed of 180 rpm for 8 hours, culturing at room temperature still for 48 hours, statically cultivating at intervals in the process of taking proper amount of culture solution, and stopping culturing when total number of active strains of the composite reaches 1 billion/ml to obtain needed compound bacterial original solution.    USE - The method is useful for preparing composite micro-ecological microbial inoculum to remove farm smell (claimed).    ADVANTAGE - The method prepares micro-ecological microbial inoculum in a simple and cost-effective manner.    DETAILED DESCRIPTION - Preparing composite micro-ecological microbial inoculum to remove farm smell, comprises: (a) adding lactic acid bacteria, nitrobacteria, Bacillus in a weight ratio of 2:1:1 in bacteria culture medium, culturing at 28 degrees C by shaking table under rotating speed of 180 revolutions per minutes (rpm) for 8 hours, culturing at room temperature still for 48 hours, statically cultivating at intervals in the process of taking proper amount of culture solution, stopping culturing when total number of active strains of the composite reaches 1 billion/ml to obtain needed compound bacterial original solution; (b) preparing primary deodorizing bacteria original liquid: taking sewage in farm marsh gas tank, adding 25 times of volume of pure water to dilute, adding 10 times of volume of the bacteria culture medium, fully shaking to obtain the mixed solution, adding 10 ml of mixed solution and composite bacteria raw liquid to clean test tube, shaking up for 3 minutes, culturing at constant temperature of 28 degrees C for 48 hours and every 24 hours to detect the liquid without odor when measuring the bacteria number reaches 1 hundred million per ml, where the pH value of the liquid is 4, constant-temperature culturing the liquid at normal temperature for more than 72 hours to prepare primary deodorizing bacteria raw liquid for further use; and (c) adding sewage with thallus culture medium in a weight ratio of 1:99 to form I-grade liquid culture medium, mixing the 1 grade culture medium mixed solution and primary deodorizing bacteria stock solution in a weight ratio of 5:95, stirring at 28 degrees C for 5 minutes and at constant temperature for 48 hours, stirring every 24 hours to detect the bacteria count reaches 1 hundred million/ml, mixing 1 grade and sterile stock solution and strain culture medium in a weight ratio of 2:98 to obtain grade 2 culture medium mixed solution, mixing 1 grade and sterile stock solution and the 2 culture medium mixed solution in a weight ratio of 5:95, stirring at 28 degrees C for 5 minutes and at constant temperature for 48 hours, stirring every 24 hours to observe constant-temperature culture process and detecting the bacteria to reaches 1 hundred million/ml, then taking the sewage and strain culture medium in a weight ratio of 4:96 to obtain 3 grade culture medium mixed solution, mixing 3 culture medium mixed liquid and 2 grade and sterile stock solution, than adding water to the 2 grade and sterile stock solution and the 3 culture medium mixed solution in weight ratio of 5:95, stirring at 28 degrees C for 5 minutes and at constant temperature for 48 hours, stirring every 24 hours to observe constant-temperature culture process and detecting the bacteria count reaches 1 hundred million/ml in the 3 grade and sterile stock solution, mixing the sewage and strain culture medium weight ratio of 6:94 to obtain 4 culture medium mixed solution, adding the 4 culture medium mixed liquid into 3 grade and sterile stock solution, then adding water to the 3 grade and sterile stock solution and the 4 grade culture medium mixed solution in the weight ratio of 5:95, stirring at 28? for 5 minutes and at constant temperature for 48 hours, stirring every 24 hours to observe constant-temperature culture process and detecting the bacteria count reaches 1 hundred million/ml in the 4 grade and sterile stock solution, mixing the sewage with thallus culture medium in a weight ratio of 10: 90 to obtain 5 culture medium mixed solution, adding the 5 culture medium mixed liquid into 4 grade and sterile stock solution, than adding water to the 4 grade and sterile stock solution and the 5 culture medium mixed solution in the weight ratio of 5:95, stirring at 28 degrees C for 5 minutes and at constant temperature for 48 hours, stirring every 24 hours to observe constant-temperature culture process and detecting the bacteria count reaches 1 hundred million/ml in the 5 grade and sterile stock solution, finally taking the 5 culture medium with 5 and sterile stock solution in the weight ratio of 95:5, mixing and culturing at close constant-temperature 28 degrees C, and observing constant-temperature culture process and detecting the bacteria liquid with light yellow color and acid alcohol.