Objective To construct an indicator set for assessing clinical nurses′ geriatric nursing competence at different stages of professional growth. Methods Based on literature review, expert discussion, and semi-structured interview, the indicator set for the stages of geriatric nursing competence of clinical nurses was developed, then a two-round Delphi consultation was conducted among 18 experts and the weight values of the indicators were calculated with precedence chart. Results All experts returned their questionnaires in both rounds, and the expert authority coefficient was 0.914. The Kendall′s coefficients of concordance (Kendall′s W) were 0.091-0.824 in round 1 and 0.084-0.778 in round 2 (P＜0.05 for all). The indicator set included 3 stages of geriatric nursing competence: fundamental, competent, and advanced. Each stage consisted of 3 first-grade indicators, 10 second-grade indicators and 31-49 tertiary-grade indicators. The weight values were determined. Conclusion The experts participating in the study have high authority, and the consensus-based indicator set is valid for assessing geriatric nursing competence of clinical nurses, which facilitates hierarchical training and use of clinical nurses in geriatric specialty.