A smart sling device includes a body; a support rod installed at the body; and a sling member installed at the support rod and inserted under a patient to support the patient therebelow, and the sling member includes an expanding unit having an accommodation space for accommodating air therein, the expanding unit expanding due to a pneumatic pressure generated by the accommodated air to support the patient therebelow; and an expansion limiting unit installed at the expanding unit to limit expansion of the expanding unit in one direction.