The utility model provides an antenna device and connect assembly thereof relates to transformer substation monitoring technical field, for a little less than solving current oil -immersed distribution transformer and having operating data and gather the function, the real -time situation of operation is difficult to to master, the technical problem of trouble early warning difficulty. The utilitymodel relates to an antenna device includes: oil level gaugember, liquid temperature pickup assembly and ring temperature pickup assembly, the oil level gaugember floats the subassembly including reading ware, oil pipe body and oil, and oil floats the subassembly and includes that indicator tube, hollow tube and oil float, are equipped with the magnetic substance on the indicator tube, liquid temperature pickup assembly includes oil temperature sensor, oil temperature sensor antenna, feeder and first radiation fin, ring temperature pickup assembly is including ring temperature sensor, ring temperature sensor antenna, magnetic switch, first circuit board and second radiation fin. Still relate to one kind and connect the assembly, include: foretell antenna device. This antenna device and connect assembly thereof can the multiple signal of real -time supervision, can realize the remote monitoring moreover.