The application discloses a mushroom head PNT combined antenna and a mushroom head PNT combined device. The antenna comprises a mushroom head vibrator, a mushroom support column and a mushroom bottomplate assembly, wherein the mushroom head vibrator is mounted on the mushroom support column and is provided with an annular dielectric gasket on its upper side; a circular metal plate is mounted on the upper surface of the circular medium gasket; the mushroom head vibrator is a bowl-shaped structure; the mushroom support column is installed on the central position of the mushroom bottom plate assembly through an annular fixing seat; the mushroom bottom plate assembly comprises an annular metal plate and a trapezoidal metal plate; the outer ring of the annular metal plate is provided with an annular groove; the trapezoidal metal plate is centrally symmetrically disposed perpendicular to the annular metal plate; and the upper bottom surface of the trapezoidal metal plate is tangent to the inner edge of the groove. The antenna uses modular design, is convenient to assemble, simple in structure, small in size, and low in weight, thereby saving the manufacturing cost.