Abstract: Cancer pain is a common symptom associated with tumors, and it worsens as the tumor progresses. Previously effective analgesic drugs often result in drug tolerance or increased adverse reactions when consumed in escalating doses, significantly impacting patients' quality of life and posing considerable challenges to cancer pain management. Patient-controlled analgesia (PCA) is a pre-programmed drug delivery system administered through an analgesic pump. It allows patients experiencing increased pain to self-administer additional analgesics at the press of a button. This on-demand, rapid administration of analgesic drugs provides timely and effective pain relief, serving as a valuable adjunct to the three-step analgesic ladder approach. This consensus summarizes the application, indications, drug selection, adverse reaction management, and patient education regarding PCA technology for the treatment of cancer pain and provides recommendations.