The invention discloses a power distribution automation terminal tail end situation awareness system and an alarm method. Through using a 5G slicing technology, tail end situation awareness of a powerdistribution automation terminal is divided into three slices which are a high-definition video slice, a power distribution equipment cluster slice and a power grid time sequence characteristic quantity slice, wherein the high-definition video slice is used for clearly monitoring a real-time condition of a power distribution network, and saving labor cost; the power distribution equipment clusterslice is used for directly monitoring a circuit breaker, an oil level and a temperature of a transformer, and a relay protection equipment state, and is used for reflecting a real-time state of a power grid so as to greatly reduce communication time delay; and the power grid time sequence characteristic quantity slice can discriminate a characteristic quantity influencing normal operation of thepower grid, and can be used to eliminate a fault part in real time and improve reliability of power grid operation.