The Jiangsu Biobank for the Prevention and Control of Diabetes (JBPCD) is a community-based prospective cohort study initiated in Jiangsu province, to examine the burden of complications associated with type 2 diabetes mellitus (T2DM). This study aims to better understand the incidence, risk factors, and long-term outcomes of T2DM complications to inform prevention and control strategies. From October 2013 to July 2014, 20,053 T2DM patients (7,862 males and 12,191 females) were recruited from Suzhou city and Huai’an city. Baseline data were collected through questionnaire survey, physical examination and biochemical testing, with blood samples stored in a biobank. The follow-up focused on the incidence and mortality related to T2DM complications, linked to national and local medical datasets. Between August 2019 and October 2020, the repeated assessments were completed for 13,973 participants, including questionnaire, physical examination and repeated blood collection. The study identified 1,479 new cancer cases and 3,324 cardiovascular disease cases, with an overall mortality rate of 25.66 per 1,000 person-years. JBPCD welcomes research collaborations and data access requests via email. Currently, there are no plans to provide cohort data for free public access, but specific proposals for further collaboration are welcome. For further information and collaboration, please email [jswuming@vip.sina.com] and [sc@njmu.edu.cn].