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Only a few studies investigated the impact of quarantine on anxiety of general population during a second wave of COVID-19 breakout. We aimed to compare anxiety levels of quarantined and non-quarantined people and investigate factors affecting anxiety during the second COVID-19 pandemic. A total of 1837 participants were included in this cross-sectional study. Anxiety was measured by the State-Trait Anxiety Inventory (STAI). Participants were divided into the quarantined group (QG) and non-quarantined group (Non-QG). The mean STAI-S score in the QG was significantly higher than Non-QG (41.8 ± 11.2 vs 40.01 ± 9.9), so was the proportion of severe state anxiety (11.6% vs 5.5%). Males in the QG were significantly more anxious than females evaluated by both STAI-S and STAI-T. High income was independent protective factors while moderate or bad health status and high trait anxiety level were independent risk factors for severe state anxiety. In conclusion, the COVID-19 confinement could significantly increase anxiety of quarantined people. Males were more vulnerable to the quarantine of COVID-19 with significantly increased anxiety level than females. The results suggest that attention should be paid to anxiety during a second round of quarantine due to COVID-19 and are of help in planning psychological interventions., Highlights • The COVID-19 confinement could significantly increase anxiety of quarantined people. • Males were more vulnerable to the quarantine of COVID-19 with significantly increased anxiety level than females. • Attention should be paid to anxiety during a second round of quarantine due to COVID-19.