An antenna, wherein the antenna comprises a reflective device, at least two radiating arrays whose operating bands are in a first preset frequency band and which are arranged adjacent to each other along a width direction of the reflective device, and a plurality of parasitic radiators, wherein each of the at least two radiating arrays comprises a plurality of radiating elements disposed on the reflective device along a length direction of the reflective device, each radiating array includes a same quantity of radiating elements, and the plurality of parasitic radiators are disposed between two adjacent radiating arrays in the at least two radiating arrays; wherein the plurality of parasitic radiators comprise a plurality of transversal parasitic radiators; each of the plurality of transversal parasitic radiators is disposed along a width direction of the reflective device; the plurality of transversal parasitic radiators are separately disposed on two sides of each radiating element pair comprised in the two adjacent radiating arrays; each of the two adjacent radiating arrays comprises one radiating element in each of the radiating element pair; and for each of the two adjacent radiating arrays along a width direction of the reflective device, radiating elements corresponding to the two adjacent radiating arrays are referred to as the radiating element pair, wherein a distance between a midpoint of a vertical projection of each transversal parasitic radiator on a bottom surface of the reflective device and a line connecting a radiating element pair corresponding to the transversal parasitic radiator is a preset distance value, wherein the line connecting the radiating element pair is a line connecting two radiating elements included in the radiating element pair on the bottom surface of the reflective device; and the vertical projection of each transversal parasitic radiator on the bottom surface of the reflective device is parallel to the line connecting two radiating elements included in the radiating element pair corresponding to the transversal parasitic radiator. wherein the plurality of parasitic radiators comprise a plurality of transversal parasitic radiators; each of the plurality of transversal parasitic radiators is disposed along a width direction of the reflective device; the plurality of transversal parasitic radiators are separately disposed on two sides of each radiating element pair comprised in the two adjacent radiating arrays; each of the two adjacent radiating arrays comprises one radiating element in each of the radiating element pair; and for each of the two adjacent radiating arrays along a width direction of the reflective device, radiating elements corresponding to the two adjacent radiating arrays are referred to as the radiating element pair, wherein a distance between a midpoint of a vertical projection of each transversal parasitic radiator on a bottom surface of the reflective device and a line connecting a radiating element pair corresponding to the transversal parasitic radiator is a preset distance value, wherein the line connecting the radiating element pair is a line connecting two radiating elements included in the radiating element pair on the bottom surface of the reflective device; and the vertical projection of each transversal parasitic radiator on the bottom surface of the reflective device is parallel to the line connecting two radiating elements included in the radiating element pair corresponding to the transversal parasitic radiator.