A beam tracking method, comprising: transmitting (S101), by a beam tracking initiator, a beam tracking request to a beam tracking responder; receiving, by the beam tracking initiator, a beam tracking training sequence from the beam tracking responder based on the beam tracking request, wherein the beam tracking training sequence comprises: a beam tracking training sequence unit of a current beam link, a beam tracking training sequence unit of a beam link in proximity to the current beam link, and a beam tracking training sequence unit of a backup beam link; and when it is determined according to a reception detection result of the beam tracking training sequence that it is necessary to switch to the backup beam link, transmitting (S103), by the beam tracking initiator, first link switching information to the beam tracking responder, wherein the first link switching information is used to instruct the beam tracking initiator and the beam tracking responder to switch to the backup beam link; wherein the beam tracking training sequence unit of the current beam link comprises: an automatic gain control, AGC, field and a training sequence, TRN, field of the current beam link; the beam tracking training sequence unit of the beam link in proximity to the current beam link comprises: an AGC field and a TRN field of the beam link in proximity to the current beam link; and the beam tracking training sequence unit of the backup beam link comprises: a short training sequence, STF, field and a channel estimation, CE, field of the backup beam link, wherein the STF field and the CE field are at end of the beam tracking training sequence. transmitting (S101), by a beam tracking initiator, a beam tracking request to a beam tracking responder; receiving, by the beam tracking initiator, a beam tracking training sequence from the beam tracking responder based on the beam tracking request, wherein the beam tracking training sequence comprises: a beam tracking training sequence unit of a current beam link, a beam tracking training sequence unit of a beam link in proximity to the current beam link, and a beam tracking training sequence unit of a backup beam link; and when it is determined according to a reception detection result of the beam tracking training sequence that it is necessary to switch to the backup beam link, transmitting (S103), by the beam tracking initiator, first link switching information to the beam tracking responder, wherein the first link switching information is used to instruct the beam tracking initiator and the beam tracking responder to switch to the backup beam link; wherein the beam tracking training sequence unit of the current beam link comprises: an automatic gain control, AGC, field and a training sequence, TRN, field of the current beam link; the beam tracking training sequence unit of the beam link in proximity to the current beam link comprises: an AGC field and a TRN field of the beam link in proximity to the current beam link; and the beam tracking training sequence unit of the backup beam link comprises: a short training sequence, STF, field and a channel estimation, CE, field of the backup beam link, wherein the STF field and the CE field are at end of the beam tracking training sequence. <EOS>