The invention relates to a desk used in a classroom, and belongs to the field of desks. The desk comprises two table top plates, two table base plates, two table back plates, two table side plates and table feet. The two table top plates are connected through a first rotating shaft in a rotary manner, the two table base plates are connected through a second rotating shaft in a rotary manner, the two table back plates are connected through a third rotating shaft in a rotary manner, the two table top plates are connected with the table feet through fourth rotating shafts in a rotary manner, the two table base plates are connected with the table feet through fifth rotating shafts in a rotary manner, and the joint of the two table top plates is provided with a pushing fastener, people stamp on the pushing fastener by feet to compact the joint of the table top plates, and the fastness of the table top plates is improved. After a person sit down next to the desk used in the classroom, the person can make the structure of the folding desk firm through limbs.