The invention discloses a top-loaded sleeve antenna applied to an UAV, belonging to the technical field of antennas. The top-loaded sleeve antenna of the invention solves the problems that a conventional antenna cannot realize a low profile, is complex in design and is not wide enough in frequency band. The top-loaded sleeve antenna comprises a bottom plate, wherein a sleeve monopole antenna is connected to the bottom plate; the top of the sleeve monopole antenna is connected with a top load; the top load sequentially comprises an upper disc and a disc cone part with an upward large end from top to bottom; a plurality of short-circuit columns are arranged between and connected with the bottom plate and the upper disc, so a resonance point is added to the antenna at a low-frequency position; and an annular groove is formed in the upper surface of the upper disc, so the bandwidth of the antenna is increased, and the whole working frequency band moves to low frequency. The top-loaded sleeve antenna has the effects of low profile, miniaturization and wide frequency band.