It is provided a self-capacitance touch screen detection method, device and system. The method includes: receiving a scanning waveform by a currently detected channel of a self-capacitance touch screen; inputting the voltage of the scanning waveform into an input terminal of a voltage following unit, and driving at least a preset channel that is adjacent to the currently detected channel of the self-capacitance touch screen via an output terminal of the voltage following unit; and calculating self-capacitance touch screen coordinate data for a touch in the currently detected channel. The method not only avoids the disturbance to the detection for a touch in the currently detected channel generated due to water vapor or a water droplet, but also obtains an increased relative change generated by the same touch, and thereby the detection sensibility of the self-capacitance touch screen is improved.