Objective To investigate the expression of vascular endothelial cadherin (VE-cad) in adenomyosis and its clinical significance. Methods Endometrium and smooth muscle from 40 healthy uterus (normal group) and 80 cases of adenomyosis (case group) were collected from our hospital from January 2016 to September 2017. Expression of VE-cad was detected by immunohistochemistry. Relationship between VE-cad and clinical information was determined. Results Expression of VE-cad protein in ectopic endometrial tissues was increased significantly in case group compared with that in normal group and normal endometrial tissue in case group (P < 0.05). No difference of expression of VE-cad protein in uterine smooth muscle tissue of two groups was identified (P > 0.05). Expression of VE-cad protein was positively correlated with age and duration of the disease (P < 0.05). Expression of VEcad protein in ectopic endometrium was not correlated with administration of painkillers (P > 0.05). Conclusions Increased VE-cad protein expression in adenomyosis ectopic endometrial tissue may play a role in occurrence of adenomyosis, and it is positively associated with age and duration of the disease.