Device and method for improving data sampling precision in oscillograph

The invention relates to a clock signal phase correcting unit and a clock signal phase correcting method. The clock signal phase correcting unit comprises a multi-path analog-to-digital conversion unit, a clock signal generating unit, a phase correcting signal generating unit, a phase comparing unit and a clock phase control unit; the phase correcting signal generating unit is used for generating phase correcting signals; the multi-path analog-to-digital conversion unit performs analog-to-digital conversion processing to the phase correcting signals to output at least two paths of digital signals; the phase comparing unit is used for comparing the phase of any two paths of digital signals and outputting phase difference; the clock phase control unit generates control signals according to the phase difference; and the clock signal generating unit regulates the phase of the clock signals according to the control signals. The clock signal phase correcting unit has the advantage of high sampling precision.