A method for signal transmission, applied to an active stylus, wherein the method comprises: phase-encoding information to be transmitted using a preset phase signal, to obtain an encoded signal; and transmitting a stylus tip signal, wherein the stylus tip signal comprises the encoded signal; wherein before the transmitting a stylus tip signal, the method further comprises: obtaining the stylus tip signal, according to the encoded signal and a preset beacon code signal; wherein the beacon code signal is used to determine a touch control position of the active stylus on a touch control screen; wherein the obtaining the stylus tip signal, according to the encoded signal and a preset beacon code signal comprises: obtaining the stylus tip signal, according to the encoded signal, the preset beacon code signal and a null code signal; wherein the null code signal is used to determine a start time or an end time of the beacon code signal and then perform timing-synchronization on the stylus tip signal and the touch control screen; wherein the active stylus does not transmit any signal or generate any driving signal in the null code signal; characterised in that the transmitting a stylus tip signal comprises: transmitting the stylus tip signal at multiple driving frequencies, wherein the stylus tip signal is transmitted in at least one period corresponding to a first driving frequency and the stylus tip signal is transmitted in at least one period corresponding to a second driving frequency. phase-encoding information to be transmitted using a preset phase signal, to obtain an encoded signal; and transmitting a stylus tip signal, wherein the stylus tip signal comprises the encoded signal; wherein before the transmitting a stylus tip signal, the method further comprises: obtaining the stylus tip signal, according to the encoded signal and a preset beacon code signal; wherein the beacon code signal is used to determine a touch control position of the active stylus on a touch control screen; wherein the obtaining the stylus tip signal, according to the encoded signal and a preset beacon code signal comprises: obtaining the stylus tip signal, according to the encoded signal, the preset beacon code signal and a null code signal; wherein the null code signal is used to determine a start time or an end time of the beacon code signal and then perform timing-synchronization on the stylus tip signal and the touch control screen; wherein the active stylus does not transmit any signal or generate any driving signal in the null code signal; characterised in that the transmitting a stylus tip signal comprises: transmitting the stylus tip signal at multiple driving frequencies, wherein the stylus tip signal is transmitted in at least one period corresponding to a first driving frequency and the stylus tip signal is transmitted in at least one period corresponding to a second driving frequency. obtaining the stylus tip signal, according to the encoded signal and a preset beacon code signal; wherein the beacon code signal is used to determine a touch control position of the active stylus on a touch control screen; wherein the obtaining the stylus tip signal, according to the encoded signal and a preset beacon code signal comprises: obtaining the stylus tip signal, according to the encoded signal, the preset beacon code signal and a null code signal; wherein the null code signal is used to determine a start time or an end time of the beacon code signal and then perform timing-synchronization on the stylus tip signal and the touch control screen; wherein the active stylus does not transmit any signal or generate any driving signal in the null code signal; characterised in that the transmitting a stylus tip signal comprises: transmitting the stylus tip signal at multiple driving frequencies, wherein the stylus tip signal is transmitted in at least one period corresponding to a first driving frequency and the stylus tip signal is transmitted in at least one period corresponding to a second driving frequency. obtaining the stylus tip signal, according to the encoded signal, the preset beacon code signal and a null code signal; wherein the null code signal is used to determine a start time or an end time of the beacon code signal and then perform timing-synchronization on the stylus tip signal and the touch control screen; wherein the active stylus does not transmit any signal or generate any driving signal in the null code signal; characterised in that the transmitting a stylus tip signal comprises: transmitting the stylus tip signal at multiple driving frequencies, wherein the stylus tip signal is transmitted in at least one period corresponding to a first driving frequency and the stylus tip signal is transmitted in at least one period corresponding to a second driving frequency.