Objective To revise a tool for oral health literacy assessment of periodontitis patients, and to evaluate its reliability and validity. Methods The Oral Health Literacy Adults Questionnaire（OHL-AQ）was cross-culturally adapted, and the questionnaire items were screened and supplemented through patients interview and experts meeting, then a Delphi study and a pre-test survey were conducted to revise and perfect the items, finally a Chinese version of Oral Health Literacy Adults Questionnaire for periodontitis patients (OHL-PAQ) was formed, which was utilized to investigate 720 periodontitis patients from a tertiary dental hospital in Beijing to analyze its reliability and validity. Results Totally 4 common factors were extracted via exploratory factor analysis, whose cumulative variance contribution rate was 46.116%. Confirmatory factor analysis resulted in χ2/df=1.514, RMSEA=0.032, CFI=0.950, and TLI=0.943, indicating that the model fitted well. The final OHL-PAQ included four dimensions, namely reading comprehension and knowledge ability, decision-making ability, computing ability and active listening ability, which consisted of 21 items. The Cronbach′s α coefficient of the questionnaire was 0.833, its split-half reliability was 0.847. The I-CVI of each item ranged from 0.800 to 1.000, and the S-CVI of the scale was 0.970. Conclusion The Chinese version OHL-PAQ has good reliability and validity, it can be used as a reliable tool for clinical and scientific evaluation of oral health literacy level in periodontitis patients.