The invention discloses a teaching aid with an automatic paper winding and unwinding function. The teaching aid comprises a base and a writing board. Shells are welded to the two sides of the top of the base separately, and supporting plates are connected to the top of the base in a rolling mode through bearings and located in the shells. Driven wheels are fixed to the bottoms of the supporting plates through connecting rods. A positive and negative rotation motor is fixedly mounted in the middle of the bottom of the base. An opening is formed in the inner side of the shell. End covers are fixed to the top ends of the two sides of the writing board. Rollers are mounted on the two sides of the writing board through bearings. Pressing plates are rotatably connected to the bottoms of the endcovers through bearings. Mounting grooves are formed in the bottoms of the pressing plates and the tops of the supporting plates. Rotary shafts are movably mounted in the mounting grooves between thepressing plates and the supporting plates, and writing paper bodies are wound on the surfaces of the rotary shafts. The teaching aid is simple and reasonable in design, convenient to operate, adjust and move and capable of turning paper automatically; time and labor are saved, the paper utilization rate is increased, and safety and reliability are ensured; and the teaching aid is wide in application range and suitable for popularization.