ABSTRACT Introduction The polysomnography is inconvenient and complex in diagnosing obstructive sleep apnea‐hypopnea syndrome. Diagnostic potency of more novel contactless monitoring devices are needed to be validated to screen individuals with obstructive sleep apnea‐hypopnea syndrome. The study aimed to evaluate the diagnostic value of a novel contactless sleep monitoring device in obstructive sleep apnea‐hypopnea syndrome. Methods Demographic features and parameters of monitoring devices were collected from adults with suspected obstructive sleep apnea‐hypopnea syndrome from September 2023 through March 2024. All participants were monitored with polysomnography and a novel contactless sleep monitoring device simultaneously. Results A total of 231 adults with suspected obstructive sleep apnea‐hypopnea syndrome were included in the study. In the mild, moderate and severe groups, the accuracy of the novel monitoring device was 96.97%, 85.71% and 85.71%, respectively, with a mean accuracy of 89.36%. The area under the receiver operating characteristic curve of the three groups were 0.9981, 0.9318 and 0.9486, respectively. The sensitivities were 100.00%, 87.50% and 72.00%, respectively. The specificity was 72.00%, 80.95% and 98.32%, respectively. The positive predictive values were 96.71%, 92.45% and 97.59%, respectively. Negative predictive values were 100.00%, 70.83% and 79.05%, respectively. Among 231 subjects, 162 (70.12%) had the same severity classification for both devices. The apnea‐hypopnea indexes, total respiratory events and average heart rates were highly correlated between the two devices ( p < 0.001). Conclusion The novel contactless sleep monitoring device is capable of detecting respiratory events during sleep, serving as an effective supplement for preliminary screening of obstructive sleep apnea‐hypopnea syndrome.