Aldosterone/cortisol co-secreting adenomas (A/CPA) are a rare type of primary aldosteronism(PA), and cases of aldosterone/cortisol co-secreting adenomas during pregnancy are extremely rare, with no reported cases to date. The unique physiological state of pregnancy increases cortisol secretion through the hypothalamic-pituitary-adrenal (HPA) axis and leads to elevated levels of all components of the renin-angiotensin-aldosterone system (RAAS). This can cause overlapping symptoms with abnormal cortisol and aldosterone secretion, making diagnosis very challenging. This case involves a 29-year-old woman who developed hypercortisolism at 33 weeks of pregnancy. Despite receiving treatment for her symptoms and having a successful delivery, she continued to experience hypertension and hypokalaemia after giving birth. Eventually, she was diagnosed with ACTH-independent Cushing's syndrome and primary aldosteronism due to independent cortisol and aldosterone secretion from bilateral adrenal adenomas. Following a thorough diagnosis, classification, treatment, and follow-up, the patient achieved a clinical cure while preserving normal adrenal function. Further investigation revealed that both diseases were caused by KCNJ5 and PRKACA mutations found in the bilateral adrenal adenomas.© 2024. The Author(s).