To address the problem that software clock recovery in high-speed serial links is prone to misjudging the number of symbols between transition edges under severe jitter conditions, which further causes cumulative phase distortion in the recovered clock, an anti-distortion software clock recovery method based on phase error correction is proposed. In the software clock recovery process, the phase difference between the reference clock and the recovered clock is monitored in real time to identify and correct symbol-number decision errors between transition edges. Comparative experiments with a commercial oscilloscope show that, under conditions of high random jitter and strong duty-cycle distortion, the symbol-rate estimation error of the commercial oscilloscope can reach 0.3%, whereas the relative error of the proposed method remains below 0.005%, yielding an approximately 60-fold improvement in measurement accuracy. The results demonstrate that the proposed method can effectively suppress phase distortion in the recovered clock and improve the stability and robustness of symbol-rate estimation under severe jitter conditions.