Method for realizing afternoon nap function on desk chair and dual-purpose desk chair

A dual-purpose desk chair is used for class and afternoon nap in a classroom, and comprises a desk and a chair, wherein the desk comprises a desk cabinet, a stand column and a desk base; the chair comprises a chair base, a seat plate and a backrest; the desk chair is characterized in that the desk cabinet of the desk is hinged to the stand column and can rotate to a horizontal position or an inclined position around a hinge, the seat plate of the chair is fixed or hinged to the chair base, and the backrest is hinged to the chair base; and when the desk chair is used for lying, the desk and thechair are deformed and combined into a deck chair, the desktop of the desk cabinet is positioned at the inclined position, the backrest of the chair is positioned at an outward inclined position, andthe desktop and the backrest are connected to form an inclined long backrest close to a plane for supporting the waist and back of a lying person. The desk can also be independently deformed to formthe deck chair. According t