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Diabetic striatopathy (DS) is a rare central nervous system complication of diabetes mellitus, characterized mainly by non-ketotic hyperglycemia and lateralized involuntary movements. Patients with diabetic striatopathy manifested solely by subacute cognitive decline were rarely reported. In this paper, we report a patient with DS who presented solely with subacute cognitive decline without involuntary movements, and cranial CT showed bilateral high density in the basal ganglia. In contrast, SWI showed microhemorrhages in the right caudate nucleus head. After one week of treatment, including glycemic control, the patient showed significant improvement in cognitive function, while a repeat cranial CT showed improved hyperdensity in the right basal ganglia region. 1 month later, at telephone follow-up, the patient's symptoms did not recur.