Provided are a plasma electrode device and a manufacturing method thereof. The plasma electrode device includes a first substrate including a first substrate main body having a first flow hole through which air flows and a first discharge electrode disposed on one surface of the first substrate main body and a second substrate disposed on one side of the first substrate, the second substrate including a second flow hole through which air flows and a second discharge electrode acting with the first substrate. The first substrate main body includes a ground electrode acting with the first or second discharge electrode to perform plasma discharge and a first insulator coupled to the ground electrode.