The objective of this research was to know the bacterial communities of leachates fed with cow manure and pig slurry, stored for 120 days and to see the effect on development and growth in the tomato plant. In this study, Illumina Mi-Seq sequencing was used to study the structure of the bacterial communities in the leachates produced in the vermicomposting process using pig slurry (PVL) and cow manure (CVL) as substrate for earthworms (Eisenia fetida), and the effect of leachates on greenhouse tomato (Solanum lycopersicum) production. The results showed variations in the bacterial communities of the leachates used (PVL and CVL), where the phylum Proteobacteria (36.8%) and Cyanobacteria (19.2%) prevailed in PVL, whereas Proteobacteria (46.6%) and Cloroflexi (9.9%) were the most abundant in CVL. Various bacterial groups have been identified with multiple attributes that promote plant growth and where fruit yield is maximized by the absorption of nutrients into the plants by inoculation of bacteria. Leachates from animal waste such as CVL and PVL are good promoters of the growth of S. lycopersicum and the quality of its fruit, due to the bacterial load they contain after processing by vermicomposting and treatment of leachates.