The invention provides an antenna device and a manufacturing method thereof. The antenna device comprises a body fiber composite material layer which comprises a conductive fiber composite material layer, and a core material layer which is sealed and arranged in the body fiber composite material layer. Due to the fact that the body fiber composite material layer in the antenna device comprises the conductive fiber composite material layer, namely the conductive fiber composite material layer is used for stacking, a metalization step in a conventional technology is omitted. The problems of uneven metal coating brushing and easy peeling off of electroplated coating in a preparing process are effectively alleviated. Due to high strength of the conductive fiber composite material layer, the antenna device has high mechanical strength. The antenna device has the advantages of high mechanical strength and light weight.