A multi-beam antenna system, comprising: a radio frequency port; a one-dimensional multi-beam forming module connected to the radio frequency port, wherein the one-dimensional multi-beam forming module comprises a multi-beam forming unit and a first phase control unit connected to the multi-beam forming unit, the multi-beam forming unit is configured to convert a radio frequency signal transmitted by the radio frequency port into M radio frequency signals having different phases, M is an integer greater than 1, the multi-beam forming unit has M output ends configured to respectively output the M radio frequency signals, and the first phase control unit is configured to adjust phases of the M radio frequency signals; a two-dimensional multi-beam forming module connected to the one-dimensional multi-beam forming module, wherein the two-dimensional multi-beam forming module comprises a phase shifter, a second phase control unit connected to the phase shifter, and M first power division units respectively connected to the M output ends in the multi-beam forming unit, wherein each first power division unit is configured to divide one radio frequency signal into N radio frequency signals, N is an integer greater than 1, each first power division unit has N output tributaries configured to respectively output the N radio frequency signals, the phase shifter is disposed on P output tributaries of the N output tributaries, P is an integer greater than or equal to 1, and the second phase control unit is configured to adjust a phase for the phase shifter to perform phase shifting; and M×N radiating elements connected to the two-dimensional multi-beam forming module, wherein the M×N radiating elements form a matrix having N rows and M columns, the M columns of radiating elements are respectively connected to the M first power division units, N radiating elements in each column of radiating elements are respectively connected to the N output tributaries of one first power division unit, and in the matrix having N rows and M columns, M×P radiating elements connected to output tributaries disposed with a phase shifter in the M first power division units form a matrix having P rows and M columns, wherein the multi-beam forming unit comprises a butler matrix and a one-of-S switch, wherein the butler matrix is connected to the radio frequency port by using the one-of-S switch; the butler matrix comprises S input ends, wherein S is an integer greater than 1; and the one-of-S switch comprises S output ends, wherein the S output ends of the one-of-S switch are respectively connected to the S input ends of the butler matrix; and the first phase control unit is connected to a control end of the one-of-S switch, and the first phase control unit is configured to control the one-of-S switch to select one of the S output ends for outputting. a radio frequency port; a one-dimensional multi-beam forming module connected to the radio frequency port, wherein the one-dimensional multi-beam forming module comprises a multi-beam forming unit and a first phase control unit connected to the multi-beam forming unit, the multi-beam forming unit is configured to convert a radio frequency signal transmitted by the radio frequency port into M radio frequency signals having different phases, M is an integer greater than 1, the multi-beam forming unit has M output ends configured to respectively output the M radio frequency signals, and the first phase control unit is configured to adjust phases of the M radio frequency signals; a two-dimensional multi-beam forming module connected to the one-dimensional multi-beam forming module, wherein the two-dimensional multi-beam forming module comprises a phase shifter, a second phase control unit connected to the phase shifter, and M first power division units respectively connected to the M output ends in the multi-beam forming unit, wherein each first power division unit is configured to divide one radio frequency signal into N radio frequency signals, N is an integer greater than 1, each first power division unit has N output tributaries configured to respectively output the N radio frequency signals, the phase shifter is disposed on P output tributaries of the N output tributaries, P is an integer greater than or equal to 1, and the second phase control unit is configured to adjust a phase for the phase shifter to perform phase shifting; and M×N radiating elements connected to the two-dimensional multi-beam forming module, wherein the M×N radiating elements form a matrix having N rows and M columns, the M columns of radiating elements are respectively connected to the M first power division units, N radiating elements in each column of radiating elements are respectively connected to the N output tributaries of one first power division unit, and in the matrix having N rows and M columns, M×P radiating elements connected to output tributaries disposed with a phase shifter in the M first power division units form a matrix having P rows and M columns, wherein the multi-beam forming unit comprises a butler matrix and a one-of-S switch, wherein the butler matrix is connected to the radio frequency port by using the one-of-S switch; the butler matrix comprises S input ends, wherein S is an integer greater than 1; and the one-of-S switch comprises S output ends, wherein the S output ends of the one-of-S switch are respectively connected to the S input ends of the butler matrix; and the first phase control unit is connected to a control end of the one-of-S switch, and the first phase control unit is configured to control the one-of-S switch to select one of the S output ends for outputting.