The incidence of postoperative residual neuromuscular block (PRNB) is high and good recovery of respiratory function during the recovery from general anesthesia is an important prerequisite for extubation. The diaphragm is the most dominant respiratory muscle, diaphragmtic ultrasound is a non‑invasive, safe, real‑time, and convenient technique. The review introduces various methods and indices of diaphragmatic ultrasound and summarizes cutting‑edge research advances focusing on the feasibility and accuracy of diaphragmatic ultrasound in predicting PRNB. The aim is to propose better techniques for postoperative monitoring of myasthenic residuals after general anesthesia and to promote the development of the healthcare system towards visualization, precision, and comfort.