The invention relates to a method for producing an organic fertilizer by processing waste tobacco leaves in the field, which comprises the following steps: firstly, preparing a fermentation bacterial agent by utilizing fresh horse manure, wheat straws, the waste tobacco leaves and the like; and performing compost treatment on the waste tobacco leaves by utilizing the fermentation bacterial agent to produce the organic fertilizer. According to the invention, time of processing the fresh waste tobacco leaves in the field is short; processing on the fresh waste tobacco leaves in the field can be completed in 60 to 90 days; stink and waste liquid which are generated due to natural rot of the fresh waste tobacco leaves in the field can be avoided; and in the treatment process, the high temperature period in which the temperature of materials is higher than 60 DEG C is over 30 days, pathogenic microorganisms can be effectively killed and mycosis transmission generated caused by the fact that the wheat straws and the tobacco leaves are directly returned to the field is prevented. The method is implemented on site, simple to operate, labor-saving and low in cost and has strong practicality.