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Objective: To evaluate the clinical value of pulse oximetry watch (POW) for diagnosing pediatric Obstructive sleep apnea/hypopnea syndrome (OSAHS)., Methods: We selected 32 children (boys: 25, 4-16 years old) who came to the hospital for diagnosing OSAHS from July to October 2016. Polysomnography (PSG) and POW were used simultaneously and recorded the apnea hypopnea index (AHI), LSpO 2 , and ODI 4 . Pearson analysis, t test, and receiver-operating characteristic (ROC) were used to analyze the correlation between PSG-AHI and other indicators, the diagnosis accordance rate, and the sensitivity and specificity of POW, respectively., Results: According to PSG-AHI, 32 children were divided into two groups: primary snoring (n = 5) and OSAHS (n = 27). There was no significant difference between PSG-ODI 4 and POW-ODI 4 (p > .05). A statistically significant correlation between PSG-AHI and POW-ODI 4 was found (r = .719, p < .001). When PSG-AHI >1, 5, 10, 15, and 20 events/h, the area under the curve (AUC) was 0.685 (p > .05), 0.733, 0.798, 0.922, and 0.929 (p < .05), respectively. There were high levels of sensitivity (83.33%) and specificity (92.31%) in the OSAHS with AHI >20 events/h level, whereas the sensitivity and specificity were unacceptable (<75%) at the level of AHI >1, 5, 10, and 15 events/h., Conclusions: POW cannot replace PSG to diagnose pediatric OSAHS because of low sensitivity and specificity, but can be used for screening severe OSAHS in children.