The utility model relates to a burning-loss prevention enhanced distribution transformer low-voltage isolating switch, characterized by comprising a DW type low-voltage isolating switch body and a safety piece made of an RTO type fuse tube. The switch body and the safety piece are joined through a double-fracture, and the fracture is additionally provided with a spring piece. Application of the low-voltage isolating switch improves operation cycle of an original device, operation and maintenance cost of the device is greatly reduced, faults of oxidation of the secondary isolating switch of an original 10 kV transformer are effectively solved, power failure frequency of the transformer is reduced, user repair request frequency is reduced, and workload of maintenance personnel is reduced. The isolating switch is simple in structure, good in practicality, and is safe and reliable. The isolating switch solves practical problems of operation of a10 kV distribution transformer in a device. The isolating switch has very good popularization and application values.