Objective To evaluate the effectiveness of a Coze platform-based drainage education agent for providing drainage care health education to patients after hepatobiliary surgery.Methods A convenience sample of postoperative hepatobiliary surgery patients with indwelling drainage tubes was enrolled and allocated sequentially by admission order into a control group (n=74) and an intervention group (n=72).The control group received routine drainage care, while the intervention group received routine care plus a drainage education agent developed on the Coze platform to deliver patient education about drainage care.After the intervention, patients′ self-care ability, the incidence of drainage related complications, and adverse events were compared between groups.Results After the intervention, the total self-care ability score in the intervention group was significantly higher than that in the control group (P＜0.05).The overall incidence of drainage related complications and adverse events in the intervention group was lower than in the control group, with a relative risk ratio of 4.487 (95%CI:2.078-9.688). The system usability score for the agent was （80.98±7.91） points.Conclusion The Coze platform-based drainage education agent demonstrates good usability, improves patients′ self-care ability, and reduces the occurrence of drainage related adverse events.