Splenectomy is a major surgery that requires a urinary catheter, in addition to which a drain is placed for observation. Splenectomy is mainly used for traumatic splenic rupture, hypersplenism in portal hypertension, splenic space-occupying lesions, and hematopoietic disorders. Splenectomy requires an indwelling urinary catheter during and after surgery. The important role of indwelling urinary catheterization is to assess circulating volume and other vital signs through urine output Postoperatively, urinary catheters need to be inserted and drains need to be placed. Another role of urinary catheterization is that due to anesthesia during the operation, urinary function may not recover immediately after the operation, and bed rest is required after the operation, so urinary catheters are inserted to assist urination. However, the intubation time should not be too long, otherwise it may cause infection. To summarize, urinary catheter is needed for splenectomy. If there is any discomfort, consult a doctor promptly.