The invention discloses a low profile small base station antenna applied to an indoor ceiling. The antenna comprises a metal floor, a metal column ring, a metal feed column and a metal load sheet, wherein the metal floor is laid on the indoor ceiling, the metal feed column and the metal column ring are coaxially fixed at the surface of the metal floor and are electrically connected with the metalfloor, the metal column ring is coaxially sleeved at an outer ring of the metal feed column to form a stepped coaxial feeder, the metal feed column is higher than the metal column ring, the metal loadsheet is fixed at a top end of the metal feed column and is electrically connected with the metal feed column, and a feed port is arranged between the metal feed column and the metal column ring. Theantenna is advantaged in that the structure is simple, the profile is low, impedance is good, the inclination angle is adjustable, and the frequency coverage range is complete.