A noise detecting method by comprising: obtaining a noise of each sensing electrode of a plurality of sensing electrodes of a capacitive touch screen at a current operating frequency point during an operation of the capacitive touch screen; calculating, for each sensing electrode respectively, a difference between the noise of the sensing electrode and a current noise reference of the sensing electrode to obtain a noise difference of the sensing electrode; performing, for each sensing electrode respectively, differential processing on the noise difference of the sensing electrode and a noise difference of an adjacent sensing electrode of the sensing electrode, to obtain a first processing result comprising a plurality of values, and comparing a maximum value of the first processing result with a preset first threshold; and if the maximum value is greater than the preset first threshold, determining that there is noise interference at the current operating frequency point; wherein the obtaining the noise of each sensing electrode of the plurality of sensing electrodes of the capacitive touch screen at the current operating frequency point, comprises: turning off a driving signal input to a plurality of driving electrodes of the capacitive touch screen, and sampling signals received by the sensing electrodes; and performing demodulation and integration on the signals obtained from the sensing electrodes by sampling to obtain the noises of the sensing electrodes at the current operating frequency point. obtaining a noise of each sensing electrode of a plurality of sensing electrodes of a capacitive touch screen at a current operating frequency point during an operation of the capacitive touch screen; calculating, for each sensing electrode respectively, a difference between the noise of the sensing electrode and a current noise reference of the sensing electrode to obtain a noise difference of the sensing electrode; performing, for each sensing electrode respectively, differential processing on the noise difference of the sensing electrode and a noise difference of an adjacent sensing electrode of the sensing electrode, to obtain a first processing result comprising a plurality of values, and comparing a maximum value of the first processing result with a preset first threshold; and if the maximum value is greater than the preset first threshold, determining that there is noise interference at the current operating frequency point; wherein the obtaining the noise of each sensing electrode of the plurality of sensing electrodes of the capacitive touch screen at the current operating frequency point, comprises: turning off a driving signal input to a plurality of driving electrodes of the capacitive touch screen, and sampling signals received by the sensing electrodes; and performing demodulation and integration on the signals obtained from the sensing electrodes by sampling to obtain the noises of the sensing electrodes at the current operating frequency point. turning off a driving signal input to a plurality of driving electrodes of the capacitive touch screen, and sampling signals received by the sensing electrodes; and performing demodulation and integration on the signals obtained from the sensing electrodes by sampling to obtain the noises of the sensing electrodes at the current operating frequency point.