The invention discloses a chair with a sliding plate function and solves the problem that a backrest type chair for a child to sit has a single function. The chair is characterized in that a chair back and a chair body are hinged, chair legs and the chair body are hinged, and the chair back and the chair legs can rotate relative to the chair body; when the chair back and the chair body are in included angle connection and the chair legs and the chair body are in included angle connection, a chair structure is formed, and a chair function is achieved; when the chair back and the chair body arearranged in the same plane and the chair legs rotate to be parallel to the chair body, idler wheels which are connected to the chair legs through idler wheel shafts can contact the ground, a sliding plate structure is formed, and the sliding plate function is achieved.