Objective By investigating the pathogenesis and analyzing a case of subarachnoid hemorrhage complicated with cerebral salt wasting syndrome, to improve the clinical understanding of this rare disease. Methods A retrospective analysis of cases of subarachnoid hemorrhage complicated with cerebral salt wasting syndrome was made, using the theory of “yin and yang” and “six classics” to explain the pathogenesis of the disease and the mechanism of Chinese and Western medicine of Wuling powder. Results Through retrospective comparison, patients in the Wuling powder group had a shorter course of disease than other patients [(7.83±2.25) days in the Wuling powder group, (11.84±2.51) days in the control group, P<0.05], and there was a significant statistical difference, indicating that Wuling powder can shorten the course of cerebral salt wasting syndrome. Conclusion Wuling powder has a good prospect in the treatment of subarachnoid hemorrhage complicated with cerebral salt wasting syndrome, and its efficacy can be further clarified through prospective case-control studies in the future.