The invention provides a single-screw antenna capable of improving a low elevation angle characteristic. The single-screw antenna comprises a screw (1), a dielectric support (2), a base plate (3), a short sleeve (4), double-screw bolts (5) and a connector (6). The connector (6) is located at the position of the center of the back of the base plate (3); an inner conductor of the connector (6) passes through the base plate (3) through a through hole to the front of the base plate (3) and is connected with the lower end of the screw (1); the screw (1) is supported by the dielectric support (2) and radiates polarized waves; the short sleeve (4) is positioned on the front of the base plate; eight double-screw bolts (5) are uniformly distributed outside the short sleeve (4); and the short sleeve (4) and the double-screw bolts (5) are of a combined action, so that the radiation directional diagram and the axial directional diagram of the antenna are broadened, and the low elevation angle characteristic of the antenna is improved.