Electrified formula of sulfur hexafluoride electrical equipment clean system that dehumidifies on line is including dry purge tube way, compression system and the dry purge tube way of giving vent to anger of breathing in, compression system sets up two compressed gas pipelines including parallelly connected, and the inlet end and the gas outlet of the dry purge tube storage jar on the road of breathing in of two compressed gas pipelines are connected, and the end of giving vent to anger of two compressed gas pipelines is connected with the inlet end on the dry purge tube way of giving vent to anger. The utility model discloses can absorb moisture, decomposition product and the floating dust in the operating high -voltage electrical equipment SF6 gas, accomplish the gaseous dehumidification of sulfur hexafluoride, purification and return and fill. The utility model discloses having dual absorption purification performance, guaranteeing process of exhaling and the process of inhaling, the drying that SF6 gas can be fine is filtered. Do not influence the normal operating of high -voltage electrical equipment such as circuit breaker, high -voltage switch purifying the in -process, realize online continuous operation.