The present invention discloses a programmable logic control device and a high-speed signal receiving method thereof. The programmable logic control device which includes a data series-parallel conversion unit, a delay unit, a digital clock management unit and a pseudo-data series-parallel conversion unit is adopted; the pseudo data series-parallel conversion unit performs series-parallel conversion on receive second clock signals so as to obtain pseudo-data signals; and since the path of the second clock signals and the path of data signals in the programmable logic control device are totally the same, the phases of the second clock signals, pseudo-data signals and data signals are totally consistent with one another, and therefore, when the delay unit samples the pseudo-data signals according to received first clock signals, the sampling points of the data signals can be searched out according to sampling results, the sampling edge of the first clock signals is adjusted to the number of the sampling points of the data signals, so that high-speed signal receiving can be completed. According to the programmable logic control device and the high-speed signal receiving method thereof of the invention, phase alignment adjustment of the high-speed signals can be completed without a hardware simulation circuit required, and therefore, the method has high adaptability.