The invention discloses a distributive low-voltage bus fast protection realization method for an intelligent transformer substation. The method is characterized by comprising the following steps that 1, sampling data from low-voltage segmented intervals and each side of a main transformer is received and synchronously processed; 2, substation area fault judging signals of equipment relevant to bus intervals in the transformer substation are received and processed; 3, the occurrence condition, the action region and the fault type of the low-voltage bus fault in the transformer substation are identified and judged; 4, the fault type is judged, the corresponding bus fault protection logic is executed according to the fault type, and corresponding control signals are output according to the protection logics; 5, the low-voltage bus fault, the switch failure, the dead area fault warning and clearing in the intelligent transformer substation are realized, and meanwhile, prompt information is output. The method provided by the invention is used for the fast clearing of the low-voltage side bus fault in the bus of the transformer substation, belongs to the beneficial supplementation for the backup protection of the transformer substation, and has the advantages that the low-voltage fast protection configuration in the transformer substation is completed, and the operation reliability of the transformer substation is effectively improved.