A touch detection method, comprising: performing a spread spectrum process on a driving signal to generate a spectrum-spread signal; outputting the spectrum-spread signal to a driving terminal of a touch screen; receiving, from a response terminal of the touch screen, a coupled signal formed by coupling the spectrum-spread signal received by the driving terminal to the response terminal; and performing a de-spread spectrum process on the coupled signal to obtain a touch detection signal; characterized in that, a mode of the de-spread spectrum process is a mode of a sliding-correlation de-spread spectrum, and a step size of the sliding-correlation de-spread spectrum is less than or equal to a minimum value among a plurality of preset capacitor time constants corresponding to a plurality of capacitor nodes in the touch screen; wherein the step size of the sliding-correlation de-spread spectrum and a sampling frequency of a chip of a code sequence in the de-spread spectrum process are the reciprocal with respect to each other, and a mode of setting the sampling frequency of the chip comprises: calculating a number of the sampled points of the chip according to a preset threshold of an autocorrelation function of the code sequence; and calculating the sampling frequency of the chip in accordance with the number of sampled points of the chip, and a length and a time width of the code sequence; wherein calculating the number of the sampled points of the chip according to the preset threshold of the autocorrelation function of the code sequence comprises: calculating a time delay difference threshold corresponding to the preset threshold in accordance with an expression of the autocorrelation function and the preset threshold; and calculating the number of the sampled points of the chip in accordance with the time delay difference threshold. performing a spread spectrum process on a driving signal to generate a spectrum-spread signal; outputting the spectrum-spread signal to a driving terminal of a touch screen; receiving, from a response terminal of the touch screen, a coupled signal formed by coupling the spectrum-spread signal received by the driving terminal to the response terminal; and performing a de-spread spectrum process on the coupled signal to obtain a touch detection signal; characterized in that, a mode of the de-spread spectrum process is a mode of a sliding-correlation de-spread spectrum, and a step size of the sliding-correlation de-spread spectrum is less than or equal to a minimum value among a plurality of preset capacitor time constants corresponding to a plurality of capacitor nodes in the touch screen; wherein the step size of the sliding-correlation de-spread spectrum and a sampling frequency of a chip of a code sequence in the de-spread spectrum process are the reciprocal with respect to each other, and a mode of setting the sampling frequency of the chip comprises: calculating a number of the sampled points of the chip according to a preset threshold of an autocorrelation function of the code sequence; and calculating the sampling frequency of the chip in accordance with the number of sampled points of the chip, and a length and a time width of the code sequence; calculating a number of the sampled points of the chip according to a preset threshold of an autocorrelation function of the code sequence; and calculating the sampling frequency of the chip in accordance with the number of sampled points of the chip, and a length and a time width of the code sequence; wherein calculating the number of the sampled points of the chip according to the preset threshold of the autocorrelation function of the code sequence comprises: calculating a time delay difference threshold corresponding to the preset threshold in accordance with an expression of the autocorrelation function and the preset threshold; and calculating the number of the sampled points of the chip in accordance with the time delay difference threshold. calculating a time delay difference threshold corresponding to the preset threshold in accordance with an expression of the autocorrelation function and the preset threshold; and calculating the number of the sampled points of the chip in accordance with the time delay difference threshold.